Log files empty

[memignone]

Version

I tried the same thing on multiple versions

singularity-ce version 4.3.0
singularity version 3.7.1
singularity version 3.7.1-1.el8

Actual behaviour

$ singularity plugin list
ENABLED  NAME
    yes         github.com/sylabs/singularity/log-plugin
$ singularity pull library://alpine
$ singularity instance start   alpine_latest.sif     instance1
$ singularity instance list -l
INSTANCE NAME    PID            LOGS
instance1                  623941      /home/<user>/.singularity/instances/logs/<host>/<user>/instance1.err 
                                                   /home/<user>/.singularity/instances/logs/<host>/<user>/instance1.out
$ singularity exec instance://instance1 cat /etc/os-release
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.15.5
PRETTY_NAME="Alpine Linux v3.15"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://bugs.alpinelinux.org/"
$ singularity shell instance://instance1
Singularity> echo "hello world!"
hello world!
Singularity> python
/bin/sh: python: not found
Singularity> exit
$ singularity instance stop -a
INFO:    Stopping instance1 instance of /home/<user>/Downloads/singularity-ce-4.3.0/alpine_latest.sif (PID=623941)
$ cat /home/<user>/.singularity/instances/logs/<host>/<user>/instance1.out
$ cat /home/<user>/.singularity/instances/logs/<host>/<user>/instance1.err

Both log files exist but they are empty. Why is that?
Not even installing the example log-plugin is working.
Any ideas?

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