In that case, it’s my linux /windows folder which became read-only and got recreated as a separate drive that I had to mount…
Main issue being that Windows (the OS) is terrible at reading linux file systems.
I’m confident this issue happened because of W10 latest update. I tried many options including reinstalling (several) linux(es) and only one that worked was recreating that NTFS partition from nil.
So far, it works but I still haven’t relaunched the W10 part of the system…. ^_^