Bit of background – I don’t remember when WordPress switched me to the new block editor. At the same time, it switched my phones to it at the same time. I have the WordPress app, but use Chrome when posting. When I started to re-blog a post, I had a notice to switch to the new block editor.
When I started this new post, I didn’t get the notice to switch. Of the 2 posts I scheduled on this phone this morning, it was the new block editor. The 7 posted from my laptop were the new editor as well.
Seems to be a one-time occurrence or possibly rare as when I did the re-blog as tomorrow’s first post after having to start the post over, it didn’t show back up.