Overwriting tabs does not work

[BlackDark]

Hey,

Setup:

• dockware container: dockware/dev:6.3.5.1
• copied content from container and working on it via SFTP as described in docs

i followed your guides and tried to get successful with step 8: https://docs.shopware.com/en/shopware-platform-dev-en/how-to/indepth-guide-bundle/storefront#adding-the-bundle-itself

And here nothing seems to work anymore.
Because the overwriting of the original Storefront tabs.html.twig seems not to happen no matter what i do.

The badge on top does appear but not the additional tab as the guide tells it should. Why does overwriting the index.html.twig works fine but not the tabs.html.twig? (Tried other things like headline and that does also not work)

Not sure what the loading mechanisms are but the only way i could get it to work was to manually overwrite the tabs part in the index.html.twig:

And load the a custom twig file (other naming) which does what the overwriting should do:

And now i see the additional tab:

Very confusing :O
Any idea why it behaves like this or is this by design?

EDIT:
After further investigation I noticed that if i run bin/console cache:clear the tabs.html.twig will be loaded (but just once) if i change again i would again need to clear the cache.
This is not needed for the index.html.twig.
Maybe a cache related error? At least this is really painful for development where we need to see fast changes.

Also I read that dockware/dev is not the correct setup for this?
Is there a documentation on how to setup dockware correctly for plugin development?