Delete attachment with sizes not working on Windows file system

[kybernetikservices]

I wrote a custom plugin for importing data, including media files, from a CRM system. The media files are stored in a dedicated folder in wp-content/uploads.
When I delete a custom post I do also delete the attached media files with
wp_delete_attachment().
I noted, on a Windows server, that just the primary image file will be deleted. All related image sizes are not deleted.

I debuged the function wp_delete_attachment_files() in wp-includes/post.php and figured out there is something wrong with the function path_join() (see code line 6240).
Before path_join() the variable $intermediate_file is

E:/folder1/folder2/folder3/wp-content/uploads/extra-folder/91010/65535_49693031347_cd702ea089_h_1280_700_nofilter-300x164.jpg.

It is the full windows path including file.
After $intermediate_file = path_join( $uploadpath['basedir'], $intermediate_file ); the variable $intermediate_file is equal

E:/folder1/folder2/folder3/wp-content/uploads/E:/folder1/folder2/folder3/wp-content/uploads/extra-folder/91010/65535_49693031347_cd702ea089_h_1280_700_nofilter-300x164.jpg

Please check the path. It has added the full $intermediate_file to the $uploadpath['basedir'].
Same happen with the $intermediate_dir. After usign path_join() (line 6234) the path is

E:/folder1/folder2/folder3/wp-content/uploads/E:/folder1/folder2/folder3/wp-content/uploads/extra-folder/91010

As you can see, it is the $uploadpath['basedir'] followed by the full folder path.

The same code is working on a linux server as expected.

Please let me know if I can give you more details to reproduce and fix this error.

Thanks for all your effort.