Arrows not properly colored when using automap

[MasterScrat]

I am using the automap to make ViZDoom act more like a regular Atari environment.

I am trying to make it more readable for the agent by giving different colors to the different entities, using "Fullscreen map colors" (https://zdoom.org/wiki/CVARs:Automap#Fullscreen_map_colors)

This works well for enemies, however it looks like am_yourcolor is not handled properly: the arrow representing the player stays white, and instead of changing its color it adds a weird symbol on top ot it:

This is using

game.add_game_args("+am_followplayer 0")
game.add_game_args("+viz_am_scale 1")
game.add_game_args("+am_yourcolor ff00ff")
game.add_game_args("+am_thingcolor_monster 0000ff")

Any idea what's going on?