Seems like Windows runner is simply not executing sbt commands in this workflow - Drop AppVeyor, run CI on Ubuntu and Windows · scalacenter/scalajs-bundler@29b9656 · GitHub. It is run with a matrix strategy, Linux job is working fine. What could be the cause?
Issue was outdated action - we replaced GitHub - olafurpg/setup-scala: GitHub Action to install any version of Java (GraalVM, Java 8, Java 11, Java 14, ...) via Jabba. Works for any JVM language including Java, Scala and Kotlin. with GitHub - coursier/setup-action: ▶️ GitHub Action using Coursier to install JVM and Scala tools.