[QUESTION] Missing Walls

When I build an addition to a lower floor after I've already added another floor, there is always missing walls. Please fix, really breaks the immersion. https://imgur.com/a/uoXJRoh

Hello. actually this is not a bug. as each floor can be modified apart from the others, in this case you just need to add certain foundation area in the upper floor - then you have to options:
1.) delete recently added foundations with dynamite tool - creating exterior roofing - make a balcony for example
2.) build walls and use the are as a part of interior

Hope it is usefull

If I remember correctly, it wouldn't let me.....I will check on that and update as needed. Thanks.

If you will experience some issues please upload also saved game file so we could analyze the issue