Hi,
Make sure you have properly updated both PUN asset and the PlayMaker related asset from the Ecosystem.
I can't replicate this here so it's likely something that got corrupte within the project, due to not updating.
Test on a totally empty project, bring PlayMaker, then PUN , then the bridge and if this is fine, then you need to clean up your project.
let me know if this still occurs.
Bye,
JEan