If we are in the builder and for some reason we are logged out in another tab, the builder will not save and will display an error until we reload it. If you try the same scenario in Gutenberg, there will be no problem saving.
I’m not quite sure how this is related to custom auth pages
However, I don’t see a bug. If I have two tabs open in parallel (Gutenberg post and WP Dashboard) and log out, I am prompted with the WP login screen, so I can’t save before logging back in and reloading.
I’m not quite sure how this is related to custom auth pages
Yes, you are right. I confused this with another similar report I published at the same time. So Custom auth pages has nothing to do with it.
so I can’t save before logging back in and reloading.
That’s exactly the point. In Gutenberg, there’s no need to reload. You can save immediately after logging in. But in Bricks, you get an error And it is not possible to save until the builder is reloaded.