Can’t define Event category

Hi there

We noticed today that we can’t define the category anymore in block editor. Category pannel stay empty (with “add new category” link)
[img]https://ibb.co/xFjP7VH[/img]

I’ve noticed that a call failed in 404 :
/wp-json/false/event-categories?context=view&per_page=100&orderby=name&order=asc&_fields=id%2Cname%2Cparent&_locale=user

the correct link should be “wp/v2” in place of “false” as other api call do.
Don’t know why it’s like that :/

How to fix this ? Where to look ?

Thanks for help