Delombok hangs if nested class carries @Builder(toBuilder = true)

Short description

When using the delombok action on a nested class with @Builder(toBuilder = true) annotation, IntelliJ hangs (see below for example project)

Expected behavior

No hangup, delombok should produce code as expected

Version information

IDEA Version: IntelliJ IDEA 2021.3.2 (Ultimate Edition), Build #IU-213.6777.52
JDK Version: 11.0.9.open-adpt
OS Type & Version: Ubuntu 20.04.4
Lombok Plugin Version: bundled 213.6777.52
Lombok Dependency Version: 1.18.22 (same results with 1.18.20 though)

Steps to reproduce

Use delombok on @Builder in the sample project below

Sample project

I created a fresh gradle project; I believe only the following two files will be relevant, though I am happy to provide the rest if required: OuterClass.java

import lombok.Builder;

public class OuterClass {

    @Builder(toBuilder = true)
    class InnerClass extends OuterClass {
    }
}

build.gradle

plugins {
    id 'java'
}

group 'org.example'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.projectlombok:lombok:1.18.22'
    annotationProcessor 'org.projectlombok:lombok:1.18.22'
}

Additional information

The same problem happens if the outer class is an interface instead (this is the setup we had in our project).

Either of the following resolve the hangup, though delombok produces compile errors in the generated code:

Remove toBuilder = true
Remove extends OuterClass

Stacktrace

The following threaddump is produced by IntelliJ; unfortunately, I cannot make much sense of it (attached as file since it's quite long)

threadDump-20220405-152256.txt

mplushnikov / lombok-intellij-plugin