Unusual error when using the ccache feature

[krop]

Since a couple days, the build log contains this after successful builds:

[ 3408s] ... cleaning ccache
[ 3408s] 1
[ 3408s] ccache: error: invalid suffix (supported: d (day) and s (second)): "3351"

According to [1], '1' means the ccache cleanup succeeded, the next line started to appear recently.

[1] https://lists.opensuse.org/opensuse-buildservice/2020-10/msg00022.html

[krop]

Any progress?