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Can not load WeakPairMap$Pair$Weak$1 classfile

See original GitHub issue

Compiler version

3.0.0, on Java 11+

Minimized code

def foo: java.lang.WeakPairMap$Pair$Weak$1 = ???

Output

[info] running (fork) dotty.tools.dotc.Main -classpath /Users/linyxus/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.5/scala-library-2.13.5.jar:/Users/linyxus/Develop/dotty/library/../out/bootstrap/scala3-library-bootstrapped/scala-3.0.0-RC2/scala3-library_3.0.0-RC2-3.0.0-RC2-bin-SNAPSHOT.jar -color:never issue/weak-pair-map-classfile.scala
error while loading WeakPairMap$Pair$Weak$1,
class file /modules/java.base/java/lang/WeakPairMap$Pair$Weak$1.class is broken, reading aborted with class java.util.NoSuchElementException
key not found: K2
-- [E008] Not Found Error: issue/weak-pair-map-classfile.scala:1:19 ------------------------------------------------------------------------------------------------------------------------------------------
1 |def foo: java.lang.WeakPairMap$Pair$Weak$1 = ???
  |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |         type WeakPairMap$Pair$Weak$1 is not a member of java.lang - did you mean lang.WeakPairMap$Pair$Weak$1?
2 errors found
[error] Nonzero exit code returned from runner: 1
[error] (scala3-compiler / Compile / runMain) Nonzero exit code returned from runner: 1
[error] Total time: 3 s, completed May 26, 2021, 2:36:49 PM