I've managed find core of the issue and fix it. Most of my playmaker stuff lives inside Plugins folder. But Ecosystem places actions outside of plugins folder. Since some of those custom actions became default actions in new version of Playmaker I had duplicates and I didn't have any errors because one version of action lived insider Plugins while other didn't. So I've transferred all my custom actions inside Plugins folder, got bunch of errors regarding duplicate action scripts, removed duplicate action scripts. Restarted Unity. Now, find and edit scripts works fine.