Yeah, it’s fine 
Wait something might spam this function resulting in constant reset of that list BEFORE the portals can connect to each other using the list…
Yes. I guess that means it wasn’t impossible to make the portals “work”…
If you lit up a portal, changed dimension and lit up the other portal - all within at most 1 second, before all activated portals got removed from the Lists - you could have had them be connected for a few ticks… 