How does seadrive cache cleanup work?

Seadrive runs on an Ubuntu Server 16.04 without GUI as daemon.

The cache settings are standard as documented in the Help Center

size_limit = 10GB
clean_cache_interval = 10

When I check for files which haven’t been accessed in the last 24 hours

find /opt/seadrive/seadrive-data/file-cache/ -atime +0 -type f -print0 | du -hc --files0-from - | tail -n 1

I get a figure which is almost 30G. Now aren’t these old file supposed to be cleaned at some point?

Is there a way to trigger the full cleanup proccess or some workaround, since the cache is filling up the drive and it’s almost not possible to define a static disk size.

Related: Seadrive cache cleanup algo