Yes, we added the ability to reuse supports when switching resin types, but not when you change the printer type from a Form 1+ to a Form 2. Although the supports for the two printers look similar, there are actually some important differences. Because of the differences in the way the two printers perform the peel, I don’t think we could really qualify Form 1+ supports on a Form 2, or vice versa. Sorry about that.
And yes, there used to be a bug where importing a FORM file that was created with a different printer type or resin would quietly load the file without telling you that it was possibly setting you up for trouble. The ability to reuse the support locations when changing resin types was actually part of the fix for that bug, because we knew lots of users needed this ability. But doing the same for printer types seemed too risky.