Parent-Attributes

[mikesimages]

I have 4 websites running on WordPress for at least ten years and have never had cause to complain, I am in the process of rebuilding them all, the site I am doing at the moment had approx. 300 pages containing 3500 vintage photographs and it was no problem at all for about the last six years. I have now reached 210 pages and suddenly I could not assign a parent page in the attributes section, the only items were Home & About us, I also noticed that the parents were very haphazardly sorted before they disappeared. I believe this is due to the Gutenberg Blocks system, I have tested this site with the Classic Editor and there is no problem except I have now built over half the site and cannot proceed with the Classic Editor as i have built a specific page template with blocks and it does not work with Classic.
To say I am annoyed is an understatement, I have wasted a lot of time trying to sort this out, if Gutenberg is so wonderful how come it cannot perform simple mathematical calculations, WordPress doesn’t seem to have the problem, I only have to look at Quick Edit and all the parents are available, any suggestions before I go bonkers would be welcome, and yes I know I can work around it with Quick Edit but that is not the point.
I was advised by Joy to test while using the Health Check plugin in Troubleshoot mode to disable plugins/theme, which I did and used the default theme but the problem was still there. The parent attributes section was still fine in quick edit mode.

[skorasaurus]

Hi Thanks for reporting. This appears to be a duplicate or closely related to https://core.trac.wordpress.org/ticket/46294 and ​https://github.com/WordPress/gutenberg/issues/12795

[mikesimages]

Ok that is fine but how come it is still going on as these duplicate reports are quite old and although I run several sites the info on the other reports means nothing to me, I am having to bodge my work tp get it done.