I noticed this while using the primary part selector in studio. If you select a primary part that is already the primary part of a model, studio throws this. Nothing really broke so a red error message doesn’t seem warranted, an orange text warn message seems more appropriate.
To be quite honest the message seems totally redundant as nothing changes by setting the primary part to the same thing with the selector, so really there is no harm done in the first place to warrant notifying the user they chose the same thing.
Bit of a nit picky request, but well yea… it’s just nit picky.