unbound does not write pidfile

[LibertyX]

Hi,

It has worked a realy long time, but since the last debian (bullseye)
Update, unbound does not write the pidfile anymore.

My Setup:

Debian GNU/Linux 11 (bullseye)
Linux 5.10.0-22-amd64
unbound stable V1.13.1

In the unbound Config i have configured the pidfile
pidfile: "/var/run/unbound/unbound.pid"

i have make the dir "unbound" under /var/run as 775 unbound:unbound

There is no Message in syslog or the unbound log regarding the pidfile

What have to be done, that the pidfile will be wrote to the condigured dir?
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