Crash in BaseTypeValidator.visitParameterizedType: ClassCastException

[cushon]

This reproduces at head with #4866 and #4875 patched in:

import java.util.List;

interface M {}

class A<T extends M, F> {
  void p(T v) {}
}

abstract class S<T extends M> {
  abstract List<A<T, ?>> p();
}

class X {

  <T extends M> void f(S<?> s, T v) {
    s.p()
        .forEach(
            field -> {
              A<T, ?> typedField = (A<T, ?>) field;
              typedField.p(v);
            });
  }
}

error: SourceChecker.typeProcess: unexpected Throwable (ClassCastException) while processing X.java; message: class org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedTypeVariable cannot be cast to class org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedWildcardType (org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedTypeVariable and org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedWildcardType are in unnamed module of loader java.net.URLClassLoader @3498ed)
  ; The Checker Framework crashed.  Please report the crash.
  Compilation unit: X.java
  Last visited tree at line 18 column 13:
              field -> {
  Exception: java.lang.ClassCastException: class org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedTypeVariable cannot be cast to class org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedWildcardType (org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedTypeVariable and org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedWildcardType are in unnamed module of loader java.net.URLClassLoader @3498ed); java.lang.ClassCastException: class org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedTypeVariable cannot be cast to class org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedWildcardType (org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedTypeVariable and org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedWildcardType are in unnamed module of loader java.net.URLClassLoader @3498ed)
        at org.checkerframework.common.basetype.BaseTypeValidator.visitParameterizedType(BaseTypeValidator.java:575)
        at org.checkerframework.common.basetype.BaseTypeValidator.visitDeclared(BaseTypeValidator.java:334)
        at org.checkerframework.common.basetype.BaseTypeValidator.visitDeclared(BaseTypeValidator.java:57)
        at org.checkerframework.framework.type.AnnotatedTypeMirror$AnnotatedDeclaredType.accept(AnnotatedTypeMirror.java:955)
        at org.checkerframework.framework.type.visitor.AnnotatedTypeScanner.scan(AnnotatedTypeScanner.java:206)
        at org.checkerframework.framework.type.visitor.AnnotatedTypeScanner.visit(AnnotatedTypeScanner.java:19