Hi ,
I’ve placed a bug into our database with very detailed reproduction steps. Thank you for being very thorough and helping me reproduce this so that I could do so. For your reference, the bug number is UE-17164. I can’t guarantee how this bug will go about being fixed as it could be the fact that the errors themselves are false positives or it may be changed in a way so that the “Check Out Modified Files” will be usable for the items that come up in the error messages. Unfortunately, for the moment I don’t have anything I could offer as a workaround.
Have a nice day,