I’m running into same problem after updating to version 2.0.3 (with WordPress: 5.2.5). Chosen meta keys vanish after clicking save button. If I try to load the saved template it loads, page gets refreshed but no entries either. Error console says no errors.
I deleted 2.0.3 and uploaded version 1.3.1. Works like a charm…
Hope you find a solution for this bug! If you need any more information, just let me know.