I can 2nd this inconsistent behavior with March of Swirling Mist. I've lost several games to paying mana, deliberately setting-up a combo/finisher turn OR attempting to counter a wrath effect to a card which "does nothing" and simply goes directly to the graveyard.

The deck I presently run it in has a few copies of Demolition Field and Cavern of Souls (both which yield colorless mana (unless Cavern is paying for its targeted card). I'll try running it with pure Blue mana to see if that's the issue. Note, that this bug has been around now for an extremely long time and on a card that typically exclusively is employed during "game breaking" moments.

Here's a recording of the bug

I've had this happen 3 times this week. I have recordings to prove it, the bug has been around for over a year.

It is inconsistent but seems to happen more when I have a mana available that taps for colorless. Such as pain lands. Every time this happens it says the auto tap solution has changed.

The spell casts, I have enough mana to pay X but the spell goes straight to graveyard without being able to choose creatures.