Hi,
there is serious bug in the latest version of SP Page Builder 5 / backend editor. It sometimes saves the changes and sometimes it doesn't. I recorded it and posted as private video on my youtube here> https://youtu.be/ePcmeuoXJYs
I am using Firefox with disabled caching.
It's frustrating to do all the work over and over. I was so happy that the new editor brings back what I loved about SP Page Builder 3, but it has this flaw. I installed it over a fullpackage website with SP Page Builder 4 and started editing the pages. But the saving is very random.
Do you have any other tips than those shared in chat, which I follow?