Hi,Trying to boot Debian Bullseye installed in an external drive, I face the same. This is on a laptop with AMD Zen 2 CPU. Unable to boot due to this issue.
As a workaround, I add the rmmod tpm line as suggested in Ubuntu bug report posted by Hervé in #17 comment.
I believe this should be added as a release critical bug for Bullseye: https://bugs.debian.org/release-critical/other/testing.html
Thanks
