Ubuntu Focal 20.04 fails

[fabianwohlfart]

Hi,
we recently must change to Ubuntu Focal 20.04 as our Build Image.
From there on the Cache does not seem to work properly.

The log says that files are cache…

… but in the next deploy there is no such thing

Again, even though the previous build says …

… the cache output.json seems emtpy.

Any leads on how to fix this?