"Changes to an object's icon/state don't update the icon/state time (for display purposes) in vis_contents children that inherit the icon or state."

I'm going to scream

hooo that's a new one

If this is intended behavior, it should be documented in the ref. People currently expect calling del(world) to be the last line of DM run, leading to esoteric bugs if file accesses occur afterwards.

Adding a displacement map to an on-screen object with the PLANE_MASTER appearance_flag does not take that object's mouse_opacity into account.

i am the shadow of the moon at night! filling your dreams to the brim with fright!

Minor text editing annoyance introduced in 511.