Problems with "Page Layouts" in page settings after clearing the cache

[da-coda]

After clearing the cache there are no other options than "Parent decides" in the drop down on the "Page Layouts" tab. You have to refresh the Frame a few times to get back all your options. The bug gets more critical if you have selected a page layout and clear the cache afterwards. Steps to reproduce:

Open the page settings for a page -> go to the "Page Layouts" tab and select a Layout -> Save, close and clear the cache -> revisit the "Page Layouts" tab and open the drop down again

In the drop down you get [INVALID VALUE("package->Layoutname")][package->Layoutname]

TYPO3: 9.5.0
Flux: 9.0.1