Since we do not support Parallels, exclude using that in the debugging process. The following thread discusses a lot of what we’ve covered here, but you may spot a difference in your situation that I may have missed.
For instance, one thing they mention is that you have to open a copy of the original project in the latest version you are trying to use in order for the “name change” workaround to work (As opposed to simply opening the current project in a later version of the engine.)
Here is the link: https://answers.unrealengine.com/questions/152144/ue461-externally-referenced-on-basic-map.html