Hi and thanks for sharing the System Info with me 🙂
You essentially led us right to the cause of conflict when you said, “FYI This ticket used to be a WooCommerce ticket, but was later switched to RSVP.”
We have a logged bug aimed to address this specific issue in an upcoming maintenance release. I unfortunately don’t have a viable workaround for the time being, but I’ve attached this thread to the logged report for the developers to reference during improvements. Stay tuned to your wp-admin and theeventscalendar.com/blog for maintenance release info.
I wish I had a better answer for you at this time and please feel free to reply back with any questions or comments you have. Cheers!