A Microsoft file hosting and synchronization service.
After months I realized that the problem is that OneDrive is unable to synchronize symlinks created from Within WSL (Windows Subsystem for Linux). Not only that, OneDrive also fails badly on those symlinks it constantly reports that it is uploading them :(
In addition to that I found out that there is no suitable way how to get the list of files which are in this problematic state. Having that list would make my research much easier and faster.
As a workaround it is possible to replace the Linux-style symlinks with Windows-style symlinks. Unfortunately they are difficult to create from within WSL and their creation requires elevation of permissions.
Here is a script which makes it easier to create the Windows-style symlinks from within WSL: https://github.com/vbrozik/vb-shell-tools/blob/main/scripts/wsl/lnw