Invisible Zombies Suddenly Appearing at the Door.

I have had a number of occasions now with the Nintendo Switch version of Replanted that while playing Level 2-5; the one where you hammer the zombies, that a zombie that was nowhere on the lawn suddenly appears at the door and costs me the game, with or without mowers (as it unfortunately just cost me my first Rest In Peace Run as well). It is happening in the other versions of the whack a squirbo game as well. Please find this sneaky squirbo and end his existence for all eternity with great impunity as he is annoying as hell and is definitely not a fun find in Rest In Peace Runs!!! Thank you for your time!