In reply to Andre.

A 502 error would have been due to excessive server load, not any particular problem with the editor. The editor is primarily javascript based. It really doesn't change anything that strongly on the backend.

The testing of it by the public started this weekend. The block editor was enabled on two of the nine forums, as well as the plugins, themes, and reviews sections. Various problems have been solved since then and it was enabled on two more forums this morning.