When Zombies run into supermarkets/grocery store they glitch into the floor. Their legs are inside the floor, while their upper torso remains above the floor.

Can also recreate this as a player by vaulting into the supermarket. You can then act as the zombies do above, or even go prone to make yourelf invisible underneath the floor. You can still loot items, and pop up out of the floor to shoot/attack.

Real immersion breaker and potential annoyance here.

I've attached photos of the same problem in Devil's Castle.

This happens with a LOT of buildings. The loot often spawns inside/under the floor.

This is the same for the castles. The loot spawns under each floor and if you look up to the ceiling you can see the items just floating there.

Duplicate of #8809 (There are houses where you never find loot in them, because it spawns beneath the floor on the ground).

If you've got further information, please refer to this post since it has been acknowledged and is the primary report on this issue.

Regards,
Johnny