Hey there, welcome to the inZOI forum!

Thank you for reporting this bug. I assume, it’s very similar to this one reported by another user:

Can No Longer Build

Here’s a short-term solution. Can you please try this in your game and see whether it begins to behave just like in the other thread? That’d really help to figure out if it’s exactly the same bug:

A long-term solution was added, but we’re not aware if it worked. Please try it in your game too: