Bug in Dark Ages level – endangered Puff-shrooms disappear

Hello,

I’ve encountered a bug in the Dark Ages world in Plants vs Zombies 2.

On the level where you need to protect the endangered Puff-shrooms, they disappear by themselves even if zombies don’t reach them.

It looks like the game treats them as temporary plants, even though they are supposed to stay for the whole level.

I’ve tried restarting the level and the game, but the issue keeps happening.

Could you please check and fix this bug?

Thank you for your help!