Hey guys, been having this bug for at least the past 6 months, and finally narrowed it down and recorded a video of it.
It happens when you duplicate an Event (I use ctrl+D), and subsequently rename it.
Here is a video of it, starting with creating a "New Project" in Spine. Note that I had to attempt recreating the bug several times (doing slightly different things) to get it to happen - so I'm not sure if seemingly unrelated things (like creating an empty Event folder, or switching from Setup to Animate and then back to Setup) are required for the bug to happen or not.
And just so its clear, in the video, I selected "Test 1" and then pressed ctrl+D to duplicate it, which created "Test 4". I then selected "Test 4" and pressed F2 to rename it, and renamed it to "RenamedTest 4" -> when I did this, "Test 1" also was renamed to "RenamedTest 4".
Sorry that video is slow, it was like my 10th attempt at recreating the bug :lol: