OK, I've made a quick search and I haven't seen anybody mention this issue. The Dungeonbowl rules on precarious positions say:

"Sometimes a player will find himself in a precarious position,
which basically means he is in a square next to something he can
fall into. For example, a player crossing a rickety rope bridge is in
a precarious position as long as he’s on the bridge, and a player
standing in a square next to a river of lava is in a similar position.
Players in precarious positions must roll D6 before they make a
block, or have a block thrown at them, and before they attempt to
throw, catch, intercept or pick-up the football. On a roll of ‘1’ the
player slips and falls into whatever it is he was standing next to,
with the effects described above. On a roll of 2-6 the player can
carry on with their action as normal."

Emphasis mine. Right now, the game implements Precarious Position rolls before carrying out a block action, but not when one's player is the target of one such block action. This has been mentioned before in the forum. In addition, the game forces a Precarious Position roll before a player attempts to throw the ball or tries to catch or intercept it, but not before an attempt to pick up the ball.

By way of example, this replay I was watching has all kinds of actions carried out in precarious positions, including the two that aren't implemented. I "dowloaded" it before being able to watch it, of course...