copyspritebgfont.csx corrupts my project in a way that is not visually noticeable but prevents saving.

[ErikTheGrate]

Describe the bug

when trying to copy a sprite from game.droid, beeter.win loses the ability to save.

Reproducing steps

1. open game.droid and beeter.win
2. on beeter.win, open copyspritebgfont.
3. in game.droid, copy the name of one of the gamepad sprites at the bottom of the sprite list to your clipboard.
4. paste it into the dialog window in beeter.win
5. once the sprite has imported, attempt to save.
6. https://www.mediafire.com/file/s2f0em0x3cbbznj/my_second_issue_with_umt_-_-.mkv/file

Setup Details

UndertaleModTool version: the latest bleeding edge version as of april 27
Operating system: Edition = Windows 10 Home, Version = 22H2, Installed on = ‎12/‎20/‎2022, OS build = 19045.4291, Experience = Windows Feature Experience Pack 1000.19056.1000.0
GameMaker Game: the game.droid file i extracted from a mobile port of the pizza tower snick demo. https://thepizzano.itch.io/pizza-tower-mobile-sage-2019 beeter.win is a modified version of a mod for pizza tower strongcold. https://www.mediafire.com/file/u96ufy8dywodwwu/beeter.win/file