Does the issue occur in the editor or during gameplay?
Editor

If it's a gameplay issue, please specify which movement system and camera type you're using (free movement vs. grid movement, third-person vs. first-person) or N/A if not applicable:
n/a

Briefly describe the issue you're experiencing:
Various UI elements bug out, such as buttons disappearing since the 1.3 update

Are there any errors in the in-game debug console or external console window?
Not sure if these are related

Provide the steps necessary to reproduce the issue:
It seems related to quick play and trying to make edits while playing. For example, I launch and can no longer click the exit button, and then various UI elements disappear. I'll try to replicate in barebones but this is a new issue since 1.3.

Provide a download link to the bare bones project (strongly recommended if it's an in-game issue, since this helps significantly when attempting to reproduce it; the report will also be given more priority in this case):
n/a

Did some testing and all I did was launch one of the premade projects, quick play and click around the UI a bunch and place some models on a map and got this. Not sure if explicitly related to quick play but that seems to be the only way I can get it. Unfortunately, repeatable steps to guarantee it happening is something I haven't nailed yet.