There is a bug in "tsegen" when the number of lags increase above 100. Is there any way to fix it?

ere is an example:

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input float(date _b_cons)
420   5.235463
421   2.637793
422  2.1695664
423   3.394307
424   3.718754
425   5.040031
426  1.6427498
427     2.9233
428  -1.251731
429   4.908429
430  2.3579211
431   2.436128
432  1.8171914
433  1.4277178
434   3.591775
435  2.3184636
436  -.7598963
437  -6.013553
438   4.366294
439   5.383612
440  1.1763055
441   6.780958
442  .15786995
443  4.1936893
444   .6976556
445 -3.4035025
446   3.047014
447   8.286017
448  4.7289295
449   8.061139
450  -.7699274
451   6.956202
452  -3.689183
453   2.490534
454   2.016589
455  -.2909603
456   7.706426
457   5.493586
458  1.7082976
459  -3.163379
460   1.908874
461  -3.350941
462 -15.846566
463   8.066164
464   9.349274
465   5.996758
466   6.470371
467  1.2135056
468 -3.1179454
469  3.0200186
470   8.939256
471  -.1552769
472   4.690305
473  -2.613032
474 -1.7396554
475  -3.074525
476  3.2035575
477   2.803353
478   5.779533
479  -2.635584
480  1.4875647
481  10.364455
482   .5120128
483  1.1400596
484  .53067344
485  2.7445076
486   8.071743
487  -.3374953
488   1.919629
489 -3.2938826
490   7.229719
491   3.461818
492  -3.645961
493 -4.6182528
494   10.43758
495   3.330606
496 -.51836735
497   .3104184
498 -2.6642945
499 -10.788202
500   6.595267
501   8.896564
502  4.3337364
503   .4236472
504  -.2026007
505   6.528147
506 -2.4020104
507 -1.3701775
508  -6.106886
509  -9.192336
510  1.4026103
511  -8.212372
512   5.783343
513   10.06681
514 -4.5076985
515  -2.501326
516 -1.4667246
517   2.041188
518   8.820198
519   10.37941
end
format %tm date
Code:
.
tsset date
tsegen r_cons = rowmean(L(1/100).(_b_cons))
(1 missing value generated)

. 
. tsegen r_cons2 = rowmean(L(1/101).(_b_cons))
invalid numlist
r(121);
Actually not really sure if the 100 obs from "dataex" will suffice to prove the point, so I'm copy/pasting a larger dataset as well.
Code:
date    _b_cons
1995m1    5.235463
1995m2    2.637793
1995m3    2.169566
1995m4    3.394307
1995m5    3.718754
1995m6    5.040031
1995m7    1.64275
1995m8    2.9233
1995m9    -1.251731
1995m10    4.908429
1995m11    2.357921
1995m12    2.436128
1996m1    1.817191
1996m2    1.427718
1996m3    3.591775
1996m4    2.318464
1996m5    -.7598963
1996m6    -6.013553
1996m7    4.366294
1996m8    5.383612
1996m9    1.176306
1996m10    6.780958
1996m11    .1578699
1996m12    4.193689
1997m1    .6976556
1997m2    -3.403502
1997m3    3.047014
1997m4    8.286017
1997m5    4.72893
1997m6    8.061139
1997m7    -.7699274
1997m8    6.956202
1997m9    -3.689183
1997m10    2.490534
1997m11    2.016589
1997m12    -.2909603
1998m1    7.706426
1998m2    5.493586
1998m3    1.708298
1998m4    -3.163379
1998m5    1.908874
1998m6    -3.350941
1998m7    -15.84657
1998m8    8.066164
1998m9    9.349274
1998m10    5.996758
1998m11    6.470371
1998m12    1.213506
1999m1    -3.117945
1999m2    3.020019
1999m3    8.939256
1999m4    -.1552769
1999m5    4.690305
1999m6    -2.613032
1999m7    -1.739655
1999m8    -3.074525
1999m9    3.203557
1999m10    2.803353
1999m11    5.779533
1999m12    -2.635584
2000m1    1.487565
2000m2    10.36446
2000m3    .5120128
2000m4    1.14006
2000m5    .5306734
2000m6    2.744508
2000m7    8.071743
2000m8    -.3374953
2000m9    1.919629
2000m10    -3.293883
2000m11    7.229719
2000m12    3.461818
2001m1    -3.645961
2001m2    -4.618253
2001m3    10.43758
2001m4    3.330606
2001m5    -.5183674
2001m6    .3104184
2001m7    -2.664294
2001m8    -10.7882
2001m9    6.595267
2001m10    8.896564
2001m11    4.333736
2001m12    .4236472
2002m1    -.2026007
2002m2    6.528147
2002m3    -2.40201
2002m4    -1.370178
2002m5    -6.106886
2002m6    -9.192336
2002m7    1.40261
2002m8    -8.212372
2002m9    5.783343
2002m10    10.06681
2002m11    -4.507699
2002m12    -2.501326
2003m1    -1.466725
2003m2    2.041188
2003m3    8.820198
2003m4    10.37941
2003m5    1.525117
2003m6    4.287084
2003m7    4.092678
2003m8    -.887289
2003m9    7.967688
2003m10    2.373686
2003m11    3.839123
2003m12    2.716236
2004m1    2.387338
2004m2    .5403522
2004m3    -2.088659
2004m4    2.631896
2004m5    3.284799
2004m6    -3.545238
2004m7    .3721508
2004m8    3.459354
2004m9    2.983926
2004m10    6.012071
2004m11    4.49592
2004m12    -2.735611
2005m1    2.75707
2005m2    -1.280343
2005m3    -2.188177
2005m4    5.276181
2005m5    2.14042
2005m6    5.804727
2005m7    -.8783106
2005m8    1.35323
2005m9    -1.19452
2005m10    5.075901
2005m11    .6873844
2005m12    5.665138
2006m1    .8695363
2006m2    3.01951
2006m3    .855085
2006m4    -3.32246
2006m5    .6032737
2006m6    -.9940714
2006m7    2.808364
2006m8    2.994838
2006m9    4.577063
2006m10    3.339844
2006m11    .1139156
2006m12    3.495108
2007m1    -.4225374
2007m2    .8233595
2007m3    3.731575
2007m4    3.664888
2007m5    -1.776025
2007m6    -3.160606
2007m7    1.830051
2007m8    3.363439
2007m9    2.825844
2007m10    -4.178416
2007m11    -.4567087
2007m12    -5.078357
2008m1    -2.352819
2008m2    -.3722515
2008m3    6.191878
2008m4    3.158991
2008m5    -9.337513
2008m6    1.546975
2008m7    3.094969
2008m8    -8.373919
2008m9    -19.81405
2008m10    -9.199307
2008m11    4.718923
2008m12    -8.08779
2009m1    -10.75193
2009m2    10.4263
2009m3    18.31033
2009m4    4.710653
2009m5    .5484291
2009m6    9.51267
2009m7    6.204119
2009m8    5.279471
2009m9    -3.269645
2009m10    5.957359
2009m11    4.871693
2009m12    -2.776152
2010m1    4.135506
2010m2    7.177095
2010m3    4.128123
2010m4    -6.788936
2010m5    -5.445671
2010m6    7.402715
2010m7    -4.147861
2010m8    10.48216
2010m9    4.117848
2010m10    1.074145
2010m11    6.752827
2010m12    2.551416
2011m1    3.990941
2011m2    1.41569
2011m3    3.588717
2011m4    -.2246896
2011m5    -1.612382
2011m6    -3.352314
2011m7    -5.605605
2011m8    -8.392247
2011m9    13.29027
2011m10    -.1068374
2011m11    .7897553
2011m12    6.774755
2012m1    4.347549
2012m2    3.242139
2012m3    -.1470295
2012m4    -6.001828
2012m5    3.216477
2012m6    .7413906
2012m7    3.250977
2012m8    2.316537
2012m9    -.5364812
2012m10    1.716443
2012m11    2.059135
2012m12    7.027034
2013m1    1.817686
2013m2    4.558779
2013m3    1.76993
2013m4    2.410212
2013m5    -.8857061
2013m6    5.690707
2013m7    -2.437881
2013m8    4.548454
2013m9    4.416081
2013m10    2.450026
2013m11    3.124556
2013m12    -1.651271
2014m1    5.385026
2014m2    .476266
2014m3    -.2388102
2014m4    2.738043
2014m5    2.777314
2014m6    -1.906321
2014m7    4.532109
2014m8    -2.281014
2014m9    4.001047
2014m10    3.338761
2014m11    .609703
2014m12    -1.664471
2015m1    5.814474
2015m2    -.2189695
2015m3    -.4475946
2015m4    1.661253
2015m5    -1.490973
2015m6    1.960627
2015m7    -5.096731
2015m8    -2.695226
2015m9    7.150155
2015m10    .9886222
2015m11    -2.342531
2015m12    -5.687355
2016m1    1.13314
2016m2    8.157931
2016m3    .8034535
2016m4    2.198958
2016m5    .2543222
2016m6    4.587239
2016m7    .80472
2016m8    .2247893
2016m9    -2.221749
2016m10    5.188889
2016m11    1.349803
2016m12    2.676084
2017m1    3.785311
2017m2    .2554602
2017m3    1.08272
2017m4    1.490748
2017m5    1.12835
2017m6    1.662535
2017m7    -.3805868
2017m8    3.008723
2017m9    1.796189
2017m10    3.990006
2017m11    1.189311
2017m12    4.741855
2018m1    -4.064924
2018m2    -.629231
2018m3    .3893539
2018m4    1.848663
2018m5    1.058095
2018m6    3.134158
2018m7    2.396392
2018m8    .1825192
2018m9    -6.977373
2018m10    3.002733
2018m11    -9.862738
2018m12    9.973344
2019m1    3.891649
2019m2    1.037475
2019m3    3.792014
2019m4    -6.624552
2019m5    7.753479
2019m6    .9524016
2019m7    -2.811851
2019m8    3.126705
2019m9    1.423111
2019m10    3.573192
2019m11    2.806139
2019m12    -1.682626
2020m1    -8.939059
2020m2    -18.6097
2020m3    14.67805
2020m4