I can confirm the same problem running on a macbook pro 15" mid 2012 with Big Sur installed with Open Core Legacy Patcher. Up until reading your post, I thought I might still have a hardware problem that corrupted my drive (I did have one, now I believe fixed). With so many things going against me was fairly confident that the EXC_CRASH (SIGABRT) was specific to my computer. I can see now that it is not and I will try to reach out to Turbo Tax on this ASAP.
I will put all the details on my crash on the 2012 macbook pro in the next post
