Veracrypt requiring a force dismount on a volume for unknown reasons

[jellyfish290]

I have a volume with a separate profile of firefox and every time I use that profile for enough time and then close it and try to dismount the volume I get a warning that files are still in use. This occurs even after closing the browser and waiting several hours before trying to dismount again.

I've tried both a portable installation of Firefox with all of it's files and configurations on the volume and a normal install with the app installed on another drive with just the profile information located within the volume and I get the same issue.

I cannot reproduce this when using it other apps/files on the drive, including other applications such as games.

Leaving Firefox open in the background with minimal interaction for several hours does not reproduce issue, I have to use the browser normally for about an hour for the issue to trigger.

I know no processes or files are open, I've checked everything, and the PowerToys utility File Locksmith running as administrator shows no processes running on it.

For a simplified step by step.

1. Actively use Firefox with a profile located inside a veracrypt encrypted volume or a portable installation of Firefox located within the volume for about an hour
2. Close the browser and ensure no other apps/files are open from that volume and wait a few seconds to ensure everything is closed.
3. Try to dismount volume
4. Notice how it asks you to force dismount. This will occur even if all apps/files have been closed from that volume for several hours and persists as many times as you attempt to dismount the volume

I'm using Veracrypt 1.25.9 on Windows 10 22H2

[Enigma2Illusion]

See post below by pkiff.

https://sourceforge.net/p/veracrypt/discussion/technical/thread/3adb2ebe95/?limit=25#46e7

[jellyfish290]

Excluding the mounted drive letter in Windows defender seems to have resolved the issue. Thank you for the help.