Inherited function type resolution is flaky

[owengray-google]

(this debugging regards kotlinSubclassFunction as inherited from KotlinSubclass by JavaLeafClass : KotlinSubclass)

Sometimes, the type of kotlinSubclassFunction in JavaLeafClass : KotlinSubclass does not resolve and becomes null. This has been observed (so far exclusively, but I have suspicions some other cases are related) in java types inheriting Kotlin class functions that don't have explicit return types (i.e. use fun foo() = "string").

Expected behaviour
The return type of kotlinSubclassFunction should be String, not null, as it is for kotlin types inheriting such things.
Our source is here:
https://cs.android.com/androidx/platform/tools/dokka-devsite-plugin/+/master:testData/inheritance/source/

Dokka version 1.6.0-dev-122

As this is flaky and seems likely to be a concurrency issue, maybe this is related to #2052?

[vmishenev]

I have opened an issue for IDE team:
https://youtrack.jetbrains.com/issue/KT-50111
But it can be fixed not soon.

[IgnatBeresnev]

KT-50111 has been fixed and I believe it should've been included into 1.6.20.

Closing this for now, but do let us know if this problem occurs again.