TextMeshProUGUI Font Disappearing on Low FPS,Unity TextMeshProUGUI Font Disappearing

I have a Unity project with 2 TextMeshPro fonts which are used: Orange Kid, and the default Liberation Sans provided by TextMeshPro.

Whenever the FPS of the game seems to drop, by either me spawning enemies, or simply wandering around the world, one of the fonts just disappear. The fonts disappear only on UGUI GameObjects though, not on in-world TextMeshPro GameObjects.

The Orange Kid font disappears, but the Liberation Sans font stays on.

I once added the Pacifico font as a way to test what is happening, and that resulted in the Orange Kid font to disappear and the rest to stay on.

I also once removed the Orange Kid font and re-imported it, and that resulted in the Orange Kid font to stay on, while the Liberation Sans font to disappear.

Really weird...

Furthermore, the game is for mobile.