All tags disappear

All my tags disappear after building the game. This leaves my game useless. I found this in the editor:

Clicking the “tags” menu on a game object:


Clicking “Add Tag…”:


What’s going on? And why are my tags different from level to level? Most importantly, why do my tags disappear after building the game?

I solved this by taking a photo of the tags, and re-adding them to the tags list. Everything is working ok now.


Better solutions are still going to be upvoted or accepted.