Title. When using Blood on the Snow, the game, with Auto Tap either On or Off (I have tried both), and Full Control On or Off, doesn't matter, will tap Snow Mana to use over already floating mana, prioritizing Snow mana even if I do not want to tap that much Snow for the effect.

This often costs me matches or results in me having very suboptimal mana use, despite the spell being a very important one in my Snow land based Brawl deck.

You can recreate this bug by floating non-snow mana (often from a creature tapping for Mana, e.g Llanowar Elves), tap 5 additional Snow mana for the effect, leaving 1 Snow land untapped, and despite having six floating mana of the right colors for the spell, the game tapper will then tap your untapped land (again, even with Auto Tap off, because it seems like the game believes you do NOT have enough mana at this point, even with 6 floating), and ONLY allow you to cast Blood on the Snow for the max snow mana, even if I only need less for the desired resurrection effect.

I will try to capture logs and screenshots for this, but this has now been reproduced for well over a year+ of playing the game with my deck that features it and snow land. Thank you!