output redirection in SystemTagList doesn't work

[wepl]

when assembling using basm I use DOSCMD to generate a datestamp for later INCBIN:
DOSCMD "WDate >T:date"
INCBIN "T:date"
but it doesn't work under vamos because the file T:date is not created
vamos log shows:

17:12:02.376 dos: INFO: SystemTagList: cmd='WDate >T:date' tags=[(U:SYS_Asynch/00000023->00000000)]
17:12:02.377 dos: INFO: SystemTagList: bin='WDate' arg_str=' '
17:12:02.378 dos: INFO: DateStamp: ptr=0ccd0e sys_time=1559833922 time=[days=15131, min=0912, tick=0118]
17:12:02.379 dos: INFO: DateToStr: ptr=0ccd0e format=3 flags=0 day_ptr=000000 date_ptr=0cccee time_ptr=0cccfe [days=15131, min=0912, tick=0118] => sys_time=1559833922
17:12:02.379 dos: INFO: DateToStr: result day='Thursday' date='06-06-19' time='15:12:02'
17:12:02.379 dos: INFO: VPrintf: format='(%s)' argv=0ccce4
17:12:02.380 dos: INFO: Open: name='T:date' (old/1005/rb+) -> None

it seems to me as the redirection doesn't work