gSender M6T<n> not being passed through

Hello,
I’ve got a CNC with an ATC that can process M6Tn commands. FluidNC is the firmware.

I’ve got passthrough enabled in gSender, and the M6 mode is “Code” with no code in any of the codeblocks.

When gSender encounters a command e.g. M6T1, it actually sends M6(T1), which isn’t what I want - I do want the controller to receive the tool number as well, so it knows what tool to go pick up.