conflict between polkit (kde-authentication-agent-1) and /proc fs "hidepid=2" option: regression, or new req't?

[PGNet Dev]

I run linux KDE + Plasma5.

After recent kernel upgrades from 5.3.5x -> 5.3.6x (currently, 5.3.6-25.gd6c109d), I was no longer able to 

 -- mount removable devices
 -- build/install kernel mods for VirtualBox
 -- etc

'polkit-kde-authentication-agent-1' was not longer exec'ing -- either on boot, or manually.

it appears that /proc entry in fstab

	/etc/fstab
		...
		proc     /proc    proc    rw,nosuid,nodev,noexec,relatime,hidepid=2    0 0
		                                                          ^^^^^^^^^
		...

now has a problem with "hidepid=2"

changing

-		proc     /proc    proc    rw,nosuid,nodev,noexec,relatime,hidepid=2    0 0
+		proc     /proc    proc    rw,nosuid,nodev,noexec,relatime              0 0

fixes the problem, so that the agent execs correctly.

it appears there's a (new?) conflict between hidepid and polkit.

QUESTION:

	is this intended/expected, and un-hardening the system by removig hidepid is now required?

or, is this a regression? and, if so, in what -- polkit? 


details of findings so far, here:

	https://bugzilla.opensuse.org/show_bug.cgi?id=1154139