The AC11 migration library has some bugs in the kitchen cabinets, and perhaps some other parts, but hopefully that will be patched before you switch to 12.
You're forgetting the traditional/obvious way of moving a project forward, and that is via an archive (PLA) - where you select the option to include only those library parts that are in use, thus not including the entirety of all prior libraries as you describe. Replacing all parts with new parts is not a particularly productive use of time.
Using the PLA, you can even produce your own subset library just for the project that can load alongside the AC 12 library - if you require new lib parts for some reason, given an hour or so of weeding.
Be advised that there is no problem using old lib parts with 12 except for if you want to use the new partial display (core only) option - only the windows and doors in the 12 library display properly for partial display.
Cheers,
Karl
AC 28 USA and earlier • macOS Sequoia 15.3, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB
One of the forum moderators