Data bindings empty in calendar source properties with dynamic events

Wappler: 5.0.0 B5 and 4.9.1
OS: MacOS M1
Server: PHP/MySQL

I’ve tried this in both the latest v4 and v5b versions and it’s the same problem. After creating a calendar and adding the source, the data bindings are empty when clicking on the thunderbolt icon. If I type something in the search then all the server connects appear but not the events source.

Here’s a video to demonstrate.

Help!