Is there a way to avoid having execute permissions added automatically to files?

[longpanda]

I don't think it's a Ventoy issue. You can make a test:
1. use dd or parted or gparted to fully clear the USB (remove Ventoy completely)
2. Create a partition in the USB as you did with the Ventoy reserved space
3. copy files as you did
To check that whether this time the files have execute permissions or not.