[Exim] strange errors with permissions

Good day.

Everything is working fine, no problems are observed.
But. The log contains lines like this:
===
<date> <msgid> failed to open database lock file /var/spool/exim/db/wait-remote_smtp.lockfile: Permission denied (euid=8 egid=8)
===

Debian Linux, Exim-3.33 (from exim-tls-3.33 sid package).

What's going on?

Thanks in advance.

                   Ingvarr.