I will try then. Fortunately, I don't need the plugins inside the BIAB, will test if there is no issues when I take BIAB as a plugin for Cubase. Thanks.

First question, is if you exclude the plugins does this prevent the crash from happening? I am not saying that this is a permanent solution for you, however your answer will assist us in determining the cause of this problem.

Do you have any plan of a updating version for that issue?

Yes we plan to fix compatibility issues with Big Sur.
PG Music Inc.