OK, the table result was 5♦x-1 EW +100 which was a poor board for NS as there were a lot of 4♦=.
If you decide 3♥ was not allowed and pass was a LA, so 3♥ becomes pass, what the hell happens now ?
Possibilities
P-X-4♦-P-P-P
P-X-4♦-4♥-P-P-P
P-X-4♦-P-P-X-P-4♥-P-P-P
P-X-4♦-P-P-X-P-P-P
P-X-P-3♥-P-P-P
P-X-P-3♥-4♦-P-P-P
P-X-P-3♥-4♦-4♥-P-P-P
P-X-P-4♥-P-P-P
P-3♥-P-4♥
4♦-P-P-P
4♦-X-P-4H-P-P-P
4♦-X-P-P-P
4♦-4♥-P-P-P
and there may be others, the playing director was called, had not yet played the board at the time, and when asked for a ruling found the offending pair had skedaddled so could not be asked further what their doubles would mean.
4♥ in practice will make by W, but may not make by E, particularly if N has got a diamond raise in.
Any suggestions ?