Cbrestore fails to transfer data - Debian

I am trying to restore a dump with cbrestore on Debian 10.
cbrestore runs without error messages, but does not transfer any data.

sh cbrestore ./dump -u admin -p ***** --bucket-source=test_bucket --bucket-destination=test_bucket

The Terminal says:

bucket: test_bucket, msgs transferred…
byte : 0 total 0 last 0.0 per sec

The problem occurs on debian 10 with couchbase versions 6.0.0, 6.0.1, 6.0.3 (Enterprise). The exactly same command runs without problems on windows 10 with couchbase version 6.0.1 (Enterprise)- with the same dump.