Do you perhaps have any soft references, which may not be loading? I’ve found that when they don’t load, in an attempt to troubleshoot I open files and/or edit code, which gives me the false that they’ve loaded. Then I reset the engine, and they don’t work again. Verify that everything works immediately after the engine is reloaded, that way you know it doesn’t just work after you tinker with things.
Aside from that, debug with printscreens. Confirm that your Get Actor of Class is always working. That you Phase variable is actually set to Setup when it needs to be. Just brainstorming.