hide_sprite with value 0 is incorrectly hidden
Docs imply (I could be misunderstanding them) that a sprite should be shown for following case in spritelayout:
Sprite is unexpectedly hidden for this case. Might be an nml bug, or a docs clarification needed,
Reproducible with nml r2043.
Attached patch against FIRS r3095 reproduces the issue reliably for me. Building sprites will be incorrectly hidden for a number of industries including Bauxite Mine, Hotel, or Stockyard.