When a bridge falls (into pit), and there is a player-like (player, clone, temporal clone) on it, the bridge is drawn over the top of the tarstuff explosion from any tarstuff on the bridge, and over the falling player. Falling briar is also drawn as single-square blocks (
this). If there's no player on it when it falls, everything is drawn as expected.
(In 3.0 and 4.0 the problem was even worse; the bridge, and anything on it that should fall, disappear completely.)
While I'm talking about bridges...
This is still the case. Except for the active player, weapons vanish while falling.