I haven’t seen those new warnings; I’m not quite sure what they mean. It sounds like perhaps you have Navigation enabled, but it’s not fully set up?
If the “Reached threaded request limit” messages are gone, then switching to our build of the plugin did what it was supposed to do.
As for why parts of your model are still missing, it’s hard to say. It looks like you might be using MRQ with a view that is taller than it is wide. If so, there’s a very commonly encountered limitation in MRQ that impacts Cesium for Unreal’s ability to select the correct tiles with such an aspect ratio. More information about the problem, as well as how to work around it, can be found here: