March of Wretched Sorrow + Treasure didn't hold priority to give a casting window, even in full control.
With Necropotence, a known strategy is to draw somewhere around 19 cards, then on your end step, cast March of Wretched Sorrow by pitching most of the cards you were about to have to discard to hand size. However, even when in full control and with a treasure token available to use, the client didn't recognize that a legal play was available and skipped straight to the discard phase. It doesn't have this problem when a swamp is untapped, but for some reason the treasure wasn't recognized as sufficient to cast March.
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VoidZero52#40934
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DAC169#34537 commented
Did your opponent have out anything that could interfere with you using your treasure tokens?