Dear Maintainer,

I need to enable automatic upgrades only for few selected packages on some servers.
As documented Unattended-Upgrade::Package-Whitelist do this, I tried but didn't worked.
From a search I found an issue open on upstream where whitelist is not working as documented:
https://github.com/mvo5/unattended-upgrades/issues/293
I tried the workaround mentioned of also blacklist all:
Unattended-Upgrade::Package-Blacklist { ".*" };
But didn't worked, mark a blacklisted also the one in whitelist.
I did some other tests and search but I'm unable to found a workaround working.

Tried also on Debian 11 with unattended-upgrades 2.8, and have the same
issue.

Tried also on Debian 10 with unattended-upgrades 1.11.2, whitelist is
correctly working and without needs of blacklist all (which is perhaps
necessary in intermediate versions)