That indicates there being a problem or some kind with that VST3 plugin and Studio One. Make sure you have the latest version of it and if the functionality is the same, perhaps try using AU or VST 2.x format instead.
You may also want to report that to the plugin vendor so they can test it with Studio One 3.3.4 on that OS for better compatibility.
You can also try refreshing your application settings before putting the plugin back...
1. Go to Help>Open Settings folder.
2. Copy the contents of the folder over to a folder on your desktop.
3. Close S1 and delete the contents of the settings folder with the exception of the user.license file as well as the "Extensions" folder.
4. Open S1 and go to Studio One>Options (Preferences on a Mac) to reconfigure your settings.
5. Test to see if the problem is resolved. If it is not, please feel free to copy your settings files back over from the backup that you created in step 2.
*If you are missing presets or Sound Sets after doing this, simply double-click one of your Sound Sets under Documents>Studio One>Sound Sets.