sometimes app cannot exit when accessing cppcryptfs device files

[hbzhang3]

1. cppcryptfsctl.exe --init "f:\enc" --password 123
2. cppcryptfs.exe --mount "f:\enc" --drive "f:\plain" --password 123
3. run windowsproject1.exe
4. windowsproject1.exe creates 10 child processes, child processes keep accessing a xxx dummy file which does not exist and restart after 2 seconds.
5. wait for 2 or 3 minutes, kill parent windowsproject1.exe process in task manager or procexp
6. expected: all child processes should exit successfully
7. actual: some child processes stay in process list and cannnot be terminated manually (access denied error)
8. if i change dummy file path to \Device\HarddiskVolume4\xxx\xxxxxx", this problem does not happen. (HarddiskVolume4 is device name of C drive in my pc)

windowsproject1 source codes and executable: https://1drv.ms/u/c/01cff2ee4af3350f/IQCRZVqJNMK_Q6LCi3UNX7vRAW7ODznisgQQuYbIZBCOHYk?e=djUY9T

OS: Windows 11 25H2, I am not sure if it is a problem of cppcryptfs or Dokany.

[hbzhang3]

it turns out to be dokan issue
dokan-dev/dokany#1329