3d widget interaction not working in multiplayer

I’m trying to implement a UI using 3d widgets. Everything works perfectly in singleplayer, but when I switch to running as a listen server it all falls apart. On singleplayer, hovering changes the color of the widget, and click events are registered and communicated as expected.

When running as a listen server with 1 connected client, hovering the widget causes it to flicker between “hovered” and “unhovered”. On the server process when I mouse over the widget, the prints go something like this:
“server: hover detected”
“server: unhover detected”

On the client process the prints go something like this when I mouse over the widget:
“client 1: hover detected”
“client 0: unhover detected”

Why are there 2 client connections listed when there should only be 1 client?
Why does even the server rapidly hover/unhover the widget?
Why is this problem unique to multiplayer?

Any help or relevant insight would be appreciated.

Update: It’s a play in editor problem. In advanced settings for play in editor, setting it to run each client in a separate thread solved the problem.

Why the heck is this the case, and what on earth was wrong with running in one process?

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YOU ARE THE ONLY PERSON ON THE EARTH WHO SAVED MY LIFE!

THANKS THIS WAS A HUGE PROBLEM SOLVER