According to debug logging in log4net it seems that their project is using log4net before Epi so gets triggered from wrong assembly.
So changing:
using log4net;
to:
using EPiServer.Logging.Compatibility;
in this project fixes the problem.
The problem is that this module accesses log4net.LogManager before Epi and trigger autosetup of log4net to the wrong config, need to find a way to make sure EPiServer.Logging.Log4Net can init before initialization modules so we reported a bug also https://world.episerver.com/support/Bug-list/bug/CMS-9555