When you click “Save Changes” after making some changes to scripts, the dialog pops up to enter a commit message and do a git commit/push internally.
You type in a commit message, and a few seconds later the message text box is cleared out. It’s like there’s some sort of timer/data binding clearing out the text box automatically.
If you’re super fast you can click OK right after pasting a message into the text box and it’ll accept it, which is my current workaround.
I have experienced the same behaviour + the box pops up a second time after hitting save, but it disappears as soon as the saving is done or you hit cancel