For this turn, the two robots begin in adjacent cells; robot B is in the mud.
Robot A executes: turn right, zap (turn right), zap (move forward)
Robot B executes: turn right, forward & grab (white tile), drop
Both forward orders resulted in the message "Robot B forward is ignored because of the mud"

I haven't encountered this issue before, so I don't know if it is because I have interpreted the rules differently from the implementor, or because the first move order was given by a zap, or because the second move order was on a white tile, or the intervening turn order, or some combination of these. Perhaps other players will comment and narrow this down.

Relevant quotes from the English version of the rulebook:
"Mud has no memory : should a robot start his turn in the Mud,
it will need two Forward moves to get out even if one was
ignored on the previous turn."
Note that the rules are consistent about referring to a player's turn as
reprogramming both robots and executing both programs.

"Example 2 : A Robot starts his turn in a Mud hex. His program
is 'Forward 1x', 'Turn Left', 'Forward 1x'. The first Forward is
ignored, then the Robot Turns and moves out of the mud."

Since I felt the rules weren't completely explicit about whether a zap by the other robot counts as the same turn, I asked for clarification on BGG. According to the publisher, it does. Here is the link:
boardgamegeek.com/article/27911536#27911536
(Start at the post by tomslick)

Report closed automatically because it has not been upvoted or commented for a while.

Your bug has probably been fixed already, or was linked to a temporary failure of BGA service.

In any case, when filling a bug report, make sure to have an explicit title linked to the incident (ex: with error message), so other players can recognize it and vote for it.

This is still abug.