dmd-master/dmd-nightly has not been updated since 2020-03-10.
http://downloads.dlang.org/nightlies/
Based on past updates, the frequency of updates is indeterminate, but this suspension period is too long to make me suspicious.
This affects a number of things, including install.sh and setup-dlang (https://github.com/dlang-community/setup-dlang).
This makes it difficult for many dlang projects to keep up with the latest specifications. And probably a lot of people currently miss that dmd-master is not up to date.
It should be resolved as soon as possible!
Additionally, I did a search on Bugzilla and it appears that no one has reported it for five months. Since the dlang is currently very conservative and less breaking changes, it's likely that no one noticed.
I'm very surprised that a critical problem with such far-reaching impact has been overlooked.
Consideration should be given to operational measures to quickly detect and remedy an update failure.