Change in behavior when installing an additional PostgreSQL major version

Hi

I've noticed that the commit https://salsa.debian.org/postgresql/postgresql-common/-/commit/d9139f7777a42a39b5b6fabbffc9f020fad4dce5 has introduced a change in behavior when installing an additional PostgreSQL major version alongside any other already installed major version. (I originally asked on pgsql-general: https://www.postgresql.org/message-id/a17b7bcaf49848e5a1ec722ddfb3ba6e%40bd.so.ch)

So far, my PostgreSQL installation script relied on a new cluster being created in any case. Now, I had to add a separate pg_createcluster command, which basically wasn’t a big deal. However, as I had to do quite some research to understand why all of a sudden my script didn't work anymore, maybe you can give some background about the reasons that led to this change?

Thanks a lot,

Andy