V7 Service Release 8 Candidate 2 was released several hours ago.
The trim bug appears to be fixed based on some quick testing.
Exactly which version of SR 8 are you using? Rhino 7 SR8 Release Candidate 2 for Windows and Mac (7.8.21168) which was released today
or Rhino 7 SR8 Release Candidate 1 for Windows and Mac (7.8.21160) which was released last week ago and has the bug