Curious George has not experienced any problem, so he just tried his 64 but T-Bird (not be confused with his '64 T-Bird)  with 2021 and it had no problem.

He then went back to 2018, 19 and 20 to see how the rubber met the road.  All years did donuts and laid rubber down the track. Maybe you should switch back to 64 bit and try out the updated elder programs.

I don't know if this had anything to do with it, but I use Thunderbird with gmail account and my test subject was sent to a gmail account.