Add repeat interval stopped working

Hi,

I am having an issue with EventON Lite where adding new repeat intervals to events stopped working.

Setup:

• WordPress 6.9.4
• PHP 8.2
• EventON Lite 2.5.2

Problem:
When I click the “+ Add New Repeat Interval” button, a loading indicator appears briefly but nothing happens. No new interval is added to the list. There are no error messages in the browser console when clicking the button.

What I have already tried:

• Updated EventON plugin
• Cleared browser cache
• Changed PHP version from 8.4 to 8.2
• Saved permalinks

The feature was working fine before and stopped working around March 24, 2026. I suspect it may be related to the WordPress 6.9 update but I am not sure.

Has anyone experienced this issue or have any suggestions?

Thank you!

The page I need help with: [log in to see the link]