In WordPress (Unmanaged), in the built-in WordPress Site Health thing I get a message about this.
The REST API did not behave correctly
The REST API is one way WordPress, and other applications, communicate with the server. One example is the block editor screen, which relies on this to display, and save, your posts and pages.
The REST API did not process the
contextquery parameter correctly.
PS - I think WordPress (Managed) and WordPress (Unmanaged) probably need their own App categories, no?
@girish I should've added that site health was still reported as good even with this REST API issue. But yes, now that issue has gone away too
BTW, to get perfect good health it also recommended I uninstall Twenty Seventeen and Twenty Nineteen themes too, and to just keep the themes I was using, it's parent, and Twenty Twenty.
So perhaps only ship the package with Twenty Twenty?
(Also, an aside really, but perhaps don't ship with Hello Dolly plugin too? Uninstalling it is always one of the first things I do! I can't imagine anyone actually really wanting it)