I was able to get the same warnings in the project that you attached (thank you BTW) and I was also able to reproduce the issue in a new blank project. I’ve created JIRA UE-30031 and our developers will be investigating the issue further.
No there not related and this bug was also in 4.9 and could even date back longer than that, its not related to 4.12 i was hoping it would be fixed by now.