The NVME (just like SSD's) don't do what you think it does underneath... it never clears space, it keeps its own internal index of what is written where. (Clearing space is slow, so is not done on the fly, so it has to do "garbage collection") So it might say "sorry the disk is full" when there is a lot of free space, because it thinks the free space is still used. That is what "fstrim" or "trim" commands are for, and I suspect ntfsresize hasn't been updated to take this into account yet. Reason being, probably because few people push the limits and run into edge cases like this.

$ ls -lh /mnt/wslg/distro/mnt/d
-rw-r--r-- 1 himura himura 480G Mar 19 10:52 fj-c.vhdx
# this is a read-only f/s, I can't just `rm` from here. Thanks god it exists and gives a clue

$ ls -l /mnt/d/
drwxrwxrwx 1 himura himura          512 Mar 19 10:53 '$RECYCLE.BIN'
d--x--x--x 1 himura himura          512 Mar 19 10:53 'System Volume Information'
# this is a mounted disk D:, fj-c.vhdx is supposed to be here

$ sudo umount /mnt/d/

$ ls -l /mnt/d/
-rw-r--r-- 1 himura himura 514766929920 Mar 19 10:52 fj-c.vhdx
# how the fuck is possible to write here with the active mount????

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