Mana tapper woes part eleventy billion
Have four lands - 3 swamps and one colourless, plus two powerstones producing {c}.
Manually tap the two powerstones to pay 2/4 of the mana for CMC 4 creature with an activated ability costing {b}.
Arena decides that it's a good idea to tap all of my lands as well to pay for this, so I'm left with two useless floating colourless mana and no way to pay the activated ability of this creature which I need to block with.
Usually the tapper does a passable job but this isn't even an edge case this is just pretty routine example where it should leave a swamp untapped and use floating mana and it decided to do this instead - why?
Hope this helps.
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Statist#85993 commented
powerrstone mana can not be used for non artifact spells. so if your creature was not an artifact creature then this was no bug