Error message appears while editing a post that is connected to another post using Types relationship

Symptoms

If you edit a post that has a relationship with another post type.

The relationship is constructed with Types

An error message appears on top of the post relationship block:

The block editor requires JavaScript. Please enable JavaScript in your browser settings, or try the Classic Editor plugin

This message appears only if Guttenburg is active.

Workaround

In the mean time, this is not dorectly related top Types, it’s related to WordPress core and we already proposed a fix for this here: https://core.trac.wordpress.org/ticket/45451

The fix is to add a filter to WordPress core. later we will use this filter to remove this error message.

Currently, you can disable guttenburg to hide this message.