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Starting with version 1.2023.2 (which is online as a beta), PlantUML handles differently namespaces and packages.
There won't be any difference between namespaces and packages anymore: both keywords are now synonymous.
The drawing is slightly different, because we now also draw intermediate packages. Note that this is not a final choice, it depends on the feedback from users.
Packages now involve the definition of a namespace, as in any ordinary programming language. The default separator is the dot (.) but can be changed using the
set separator X directive. You can also disable namespace management using
set separator none, in which case you get back a behavior similar to older versions of PlantUML.
The parser is also slightly more strict. You now have to declare an element before adding a note on it, for example.
Usually we try to make improvements that don't break backwards compatibility. Here we were forced to put in a more consistent behavior, which unfortunately might break your old diagrams. However, the addition of the
set separator none should fix it, if necessary.