So I discovered that the Hood and Cloak of darkness don't work when Inventory Pets is installed, like when i try to fly with the armor pieces it changes my screen and it seems like its working but i'm not able to fly.

capnkirok/Inventory-Pets#584

Looks like an issue on their end capnkirok/Inventory-Pets#587

Looks like an issue on their end capnkirok/Inventory-Pets#587

Not related to spectator mode at all, so this is not accurate. The second link is correct (#584).