.classpath file not generated with Eclipse 2021-03

[basinilya]

I'm importing https://github.com/bbottema/outlook-message-parser 0afe0fc4b2bb5aa8d961193f7fbdfd645f654a45
When the plugin is not installed I get the regular lifecycle mapping prompt for assertj-assertions-generator-maven-plugin and the assertion classes are not generated.

To fix this I installed m2e-assertj versio 0.60 to Eclipse 2021-03. After doing a clean re-import of the project I see that even though the assertion classes were generated in target/ no .classpath file was generated and the dialog appears saying:

Test source folder 'src/test/java' in project 'outlook-message-parser' must have an output folder that is not also used for main sources

Also, there's the problem marker:

The project was not built since its build path is incomplete. Cannot find the class file for java.lang.Throwable. Fix the build path then try building this project	outlook-message-parser

The bin/ folder is created and all regular java sources are compiled into it, not target. The root source folder is src/, not src/main/java

Had to go back to Oxygen.3a Release (4.7.3a)