I've been asking for help here:
https://community.st.com/s/question/0D73W000000nnHE/detail?s1oid=00Db0000000YtG6&t=1622041167388&s1nid=0DB0X000000DYbd&emkind=chatterCommentNotification&s1uid=0053W000001U4NJ&emtm=1622013936957&fromEmail=1&s1ext=0
But its starting to look like this might not be a touchGFX problem, so I'm reposting here.
I'm getting a single UNALIGNED hardfault after power cycle when I enable double buffering. The linked post goes into more details about my setup and the things I've tried so far.
