Update: Related to Issue UE-32528
Quick simple way to reproduce this behavior below.
Make a new Variable
Make it an array
Add it to the blueprint and drag off an Add or AddUnique, something that utilizes wildcard
Then change the array variable type to something else
BUG: Now the array has been disconnected from the Add node but the Add node has not reverted back to wildcard
Which means I cannot connect my new array back to that same node (because its stilled typed).
I would expect it to either change the Add node type and stay connected. OR disconnect and revert the node back to wildcard, like below.
This is what happens when I disconnect the nodes normally.