Parent Page dropdown is missing in Page Attributes on Pages - WP 5.2.2

[pattyok]

In WP 5.2.2, on a clean install with no plugins, 2019 theme.

Create a new page or open a page for editing with the Block Editor

Expect to see the parent pages dropdown under the Page Attributes module.

Its not there.

Have to go to the Pages list, do a quick edit and change it there. (or add the classic editor plugin)

[earnjam]

Hi @pattyok. I tried to replicate on a brand new installation with 5.2.2. As long as there is at least 1 published page, then the parent page dropdown shows for me. If you delete all pages or move them to draft, then it doesn't display. You can only set a published page to a parent.

Can you confirm that you have at least one page published?

[pattyok]

Oh gosh yep. You are correct. The other page was a draft.

In trying to narrow down which plugin might be causing the issue, it looks like it is Advanced Custom Fields... I will go there...

Thanks

[pattyok]

Actually - in case anyone finds this.

The problem is with the Gallery Custom Links plugin. When that plugin is activated and a gallery has an item with a link applied to it, he wp-json response is not encoded correctly and therefore the wp-json request that is used to populate the drop down errors out.

[aparker48]

Sorry, but this is happening to me also with WP 5.2.2 and I have over 107 pages on the site and have used Health Check. When I turn on Health Check the parent pages drop-down magically appears on my editor pages. I can turn on ALL my plugins and as long as I have Health Check running, the Parent Page selection is available from the editor. Turn off Health Check and Parent Page selection disappears and it is back to publishing the page and going out to the page listings to use quick edit to set the parent. There is a problem in there somewhere, but I cannot find it. Please investigate this again and report any workarounds or fixes.

[earnjam]

Replying to aparker48:

Sorry, but this is happening to me also with WP 5.2.2 and I have over 107 pages on the site and have used Health Check. When I turn on Health Check the parent pages drop-down magically appears on my editor pages. I can turn on ALL my plugins and as long as I have Health Check running, the Parent Page selection is available from the editor. Turn off Health Check and Parent Page selection disappears and it is back to publishing the page and going out to the page listings to use quick edit to set the parent. There is a problem in there somewhere, but I cannot find it. Please investigate this again and report any workarounds or fixes.

You need to check the console for javascript errors while in the editor. My guess is your situation is similar to the pattyok where a plugin is messing with the API response.

If the problem persists when you deactivate all plugins, then we can reopen and troubleshoot some more, but since this is almost certainly a plugin issue, your question would be better suited on the support forums.

[georgegeorgiou]

This is not a bug, please check the explanation https://core.trac.wordpress.org/ticket/45987#comment:2 and ​https://wordpress.org/support/topic/custom-post-types-cannot-be-hierarchical-with-5-0/