I’ve come across this issue with tiled terrain. I was unable to import all of it at once because there were too many pieces. Now, there are seams between my different ‘sections’. As far as I can tell they are all on the same layer, but I can not edit from one to the next. I am forced to click onto the next tile to move over to that section.
I’ve looked, but I haven’t been able to find any similar issues here. Is there an easy fix for this I am missing? Or do I just need to go back and figure out a way to import all my tiles all at once, even if that means reducing their number and increasing resolution.