what version of rclone are you using, be sure to update to v1.51.0.
what version of winfsp are you using, be sure to update to 1.6.
then test again.
i would suggest that you simplify the mount command as much as possible, then add flags one by one, if needed.
when i use mount, my command is very simple.
rclone mount remote x: --vfs-cache-mode=minimal
with that simple command, i can copy files using windows explorer, fastcopy, secondcopy, double commander and use programs like wiztree.
in addition, see this post, where i copy the handbrake program to the x: and RUN handbrake.exe on x:, not c:
the point is that the mount command can be very simple, few flags, yet very powerfull.