[@ruippeixotog]: https://github.com/ruippeixotog

[#6915]: https://github.com/sbt/sbt/issues/6915
[#6926]: https://github.com/sbt/sbt/pull/6926

### Bug Fixes

- Make `++ <scala-version> <command>` run `<command>` only on compatible Scala 3 subprojects. [#6915][]/[#6926][] by [@ruippeixotog][]