https://discord.com/invite/scala
Most of the core community hangs out there, and some of the folks that contribute to the compiler too. If there's someone that knows, they're either on the Discord or the forums.
Even for niche things like D language, the Discord is the place to go. I learned Scala 3 and D mostly through the help of folks from their Discord servers guiding me.
I would not risk assuming maintainers of an open source project to have the reflex of jumping into Discord to ask questions.
Anyway, D has a forum and an IRC channel. Scala has a Discourse.
The nice thing about forums is that problems and solutions are searchable by other people in the future. I learned many things by myself thanks to this. I would not like to live in a world where you need to engage with people all the time, asking the same questions again and again, to use some tool or some programming language.
[1] https://drewdevault.com/2022/03/29/free-software-free-infras...