Cancellation Error when trying to cancel with #_BOOKINGBUTTON

When using the #_BOOKINGBUTTON in the single event plugin, our users are unable to cancel bookings. I’ve seen this previously reported here:

There seems to be no support for this issue, though it’s affecting some users. I applied the JS fix suggested in one of those threads, but it didn’t work for us. I did a rollback on the plugin, but the issue persists.

Doesn’t look like the plugin author responds to support requests here anymore. Hopefully someone can suggest a fix, or it can be fixed in a future version.

This is a core functionality problem, and should not be ignored. It completely affects the functionality of the plugin for users.