Alias don't get updated properly

[albertz]

It seems some of the aliases don't get updated properly anymore. I have this case now for some alias which already existed from some earlier run, but I changed the config, thus it got a new job hash, and should update this alias.

This has always worked fine. But now it does not anymore. This might be a result of #214.

In main output, I see:

...
[2024-11-28 06:08:27,767] INFO: running: Job<alias/ctc/time4-n12-spm512-blankSep-auxAED-b150k-ctcFixGrad/train work/i6_core/returnn/training/ReturnnTrainingJob.aJAdtFpzqsEc> {ep 20/100} 
[2024-11-28 06:08:27,767] INFO: running(1) waiting(88)

However, the symlink points to an old job:

alias/ctc/time4-n12-spm512-blankSep-auxAED-b150k-ctcFixGrad/train -> /rwthfs/rz/cluster/hpcwork/az668407/setups-data/combined/2021-05-31/work/i6_core/returnn/training/ReturnnTrainingJob.9qiRvGpHLhgz

I also waited now a couple of hours, in case the create alias thread was hanging or so.

I also restarted the manager now. It still does not update the alias.

(cc @Atticus1806)