This is not a regression. Tested in //UE5/Release-5.0 CL20979098
Changed Constraints on a Static Mesh do not show up when enabling Show Only Modified Properties.
The changed Constraints are among the properties displayed.
The changed Constraints are not displayed in the list.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-170380 in the post.