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Yes, default should be hidepid=0 and all processes readable.
You have a special kernel.
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For my special interest:
does somebody happen to know how to set mount options if /proc is not in...

Ok, not present, no workaround.

Traditionally mount(-options) at boot is done in /etc/fstab - but newer Linux seem to mount /proc by magic.?

You suppress stderr. Does the ls -ld actually say "permission denied" for the others?
If yes then it can see them, and you can do
test -d /proc/<pid>BTW ls -ld /proc/{0..9}* can generate...

If /proc/<pid>/ is unreadable then it's a kernel thing.

What OS has such a broken ps?

You can test with ps
if { ps -p $pid && ! kill -0 $pid; } >/dev/null 2>&1 ; then echo $pid is not killable; else echo happy; fi
Or
if { ! ps -p $pid || kill -0 $pid; } >/dev/null 2>&1 ; then echo...