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For those interested, that bingo follows the same rules as a well known mathematical problem.
Wikipedia even give us the formula to calculate the average number of coins needed to fill the whole board.
I was able to reproduce by turning mini effect on.
I suggest trying to uncheck it before following Hardmuscle suggestion, as it will reset all you mabi settings.
Note that you'll need to summon your pet again after turning it off.
Left horse summoned when mini effect was off.
Right horse summoned after turning it on.