This is not a regression. Tested in //UE5/Release-5.2 CL26001984
Editor becomes unresponsive after compiling with save on success a widget blueprint that has logic flagged with a breakpoint within preconstruct.
Debugging opens on the break point, or an error prevents it from compiling and saving
The Blueprint begins to compile and save, but stops at 50%. The Editor becomes unresponsive.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-191824 in the post.