fix issue 9269

buildfile/src/main/scala/sbt/internal/LoadedSbtFile.scala

@@ -11,6 +11,7 @@ package internal
 
 import Def.Setting
 import java.nio.file.Path
+import scala.reflect.NameTransformer
 
 /**
  * Represents the exported contents of a .sbt file.  Currently, that includes the list of settings,
@@ -61,7 +62,7 @@ private[sbt] final class DefinedSbtValues(val sbtFiles: Seq[EvalDefinitions]) {
     for {
       file <- sbtFiles
       m = file.enclosingModule
-      v <- file.valNames
+      v <- file.valNames.map(NameTransformer.decode)
     } yield s"import ${m}.`${v}`"
   }
   def generated: Seq[Path] =

sbt-app/src/sbt-test/actions/set-kebab-case-project/build.sbt

@@ -0,0 +1,8 @@
+// https://github.com/sbt/sbt/issues/9269
+val `kebab-case-project` = rootProject
+
+InputKey[Unit]("checkVersion") := {
+  val actual = version.value
+  val expect = Def.spaceDelimited("").parsed.head
+  assert(expect == actual, (actual, expect))
+}

sbt-app/src/sbt-test/actions/set-kebab-case-project/test

@@ -0,0 +1,3 @@
+> checkVersion 0.1.0-SNAPSHOT
+> set version := "0.2.0-SNAPSHOT"
+> checkVersion 0.2.0-SNAPSHOT