Once I am back at my computer I can give a closer look but open up your game data blueprint child and in the search at the top type in “remap” without quotes. You’ll see one for remap NPC. Then click add entry, open up the drop down, in from select the original game Rex, in to put your new Rex. I don’t know exactly how far this remap goes but at a minimum I believe it fixes the Dino spawners on the islands, may not fix the other problems you have. Also be sure you are testing and spawning your Dino using the command I gave earlier in the thread.