C:\>ver
TCC 21.01.55 Windows 7 [Version 6.1.7601]
C:\>( set foo=1 & set bar=2 )
C:\>set foo
1 & set bar=2
C:\>set bar
TCC: Not in environment "bar*"
C:\>
Not command grouping per se; it's a problem with emulating some noxious CMD undocumented behavior (bug) with SET as the first command in a command group.
There is a workaround in 21.01.56 (which should be uploaded later today).
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