On startup (docker compose up) I get lots of warnings "WARNING ? odoo.tools.translate: no translation language detected, skipping translation" for my translated addon. This happens even for fields which are clearly translated correctly since they are shown correctly on the frontend. Once up and running my odoo does not produce these warnings anymore - only on startup.

At first I thought this might be related to not having the correct language context on startup. But since I don't get these warnings for base modules, I suspect this is not expected behavior.

My structure looks like this:

myaddon
--i18n
----de.po
--models
----mymodel.py
--views
----my_views.xml

Any ideas what might be the cause?
Thanks in advance!