Custom modules refusing to set tooltip format.

[Spelis]

i have this custom module that gets my current keyboard layout and i am trying to set the tooltip format but it isnt working.

	"custom/kb": {
		"format": "  {}",
		"exec": "bash ~/.config/waybar/getkb.sh",
		"interval":1,
		"tooltip-format": "Current Keyboard Layout: {}\nSwitch Keyboard Layout (󰘳 + X)"
	}

when i run waybar, the tooltip is the value of format and not tooltip-format.
this issue occurs with a different custom module as well.

EDIT:
tooltips do work with the clock module, for some reason?