Floated mana disappeared before combat step completed
During a match between SAKUYAye and I around 9:15pm Pacific Time on August 28th, I held priority to play a Samwise the Stouthearted after my creature died during combat. I blocked with a Wose Pathfinder and tapped it for green. I saw the green show up in my mana pool, but the mana disappeared after the Wose Pathfinder died. I know it was still in combat phase since I was holding priority and had the button to "end combat" so the mana should not have disappeared. Pretty sure this is some sort of bug. I don't know if I would've won the game or not, but the loss should at least be removed from my record/ranking.
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[Deleted User] commented
No, this is you not knowing the rules. Mana empties from your pool at the end of each STEP and phase. The end of the declare blockers step emptied your mana pool, so you had none when your creature died in the combat damage step.