It is unfit for purpose, and you don’t even get a response on this forum or github. I have the same text annotation problem as you, plus another bug and there is a third bug that I can’t remember now (i gave up looking after that), but all together they make it unusable. I always think that such “in your face” bugs like not even being able to change the text colour etc would be fixed in the next update, but I have updated twice now but nothing changed.
I would have liked to use it as my quick screenshot, annotation/cropping etc, save on local server for use as a link in other places, but it was just too buggy.