PHPStorm cannot open linked directories

I am running PHPStorm on Windows accessing a WSL2 Ubuntu-20.04 distribution. I do work with two projects, which have a lot of common files. Therefore I added the common directories unter project1 and linked them with ln -s softlinks  into project2.

ln -s /srv/phpstorm/project1/bundle1 .

where the soft link became now /srv/phpstorm/project2/bundle1.

When I am now trying to open a directory in project2, PHPStorm does not open the directory but states that no file typ is associated and offers to create the association.

How can I navigate through the linked dirs?