"has" method not generated for oneofs when not using external "protoc"

[rabejens]

I have this:

message Foo {
    oneof foo {
        int32 a = 1;
        int32 b = 2;
    }
}

This is how I configured the generation:

Compile / PB.targets := Seq(
  PB.gens.java(protobufVersion) -> (Compile / sourceManaged).value,
  scalapb.gen(javaConversions = true) -> (Compile / sourceManaged).value
  )

When I do:

val x = Foo(A(42))
toJavaProto(x).getDescriptorForType // < boom!

it says:

Generated message class "foo.Foo$Foo" missing method "hasA".

When I am using an explicit protoc I installed locally, it works.

How can I instruct the builtin protoc to generate the presence methods?

[rabejens]

The answer was: The plugin uses an old protoc.

I added this:

ThisBuild / protocVersion := "3.24.1"

which works.