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`extensions` is <https://docs.gradle.org/current/userguide/platforms.html|documented> as being reserved.

From the wording there, I'd take it using just `extensions` as the entire alias would be unsupported, but `extensions-foo` (extensions as first subgroup) should be fine?

unlikely, as `-` is a separator, leaving `extensions` as an alias.  Hard to know without testing it.

Yeah it's not working in my sample repo :) 