After bot plays card 'Grove Tender' and choose option 'Give each player a Mana Crystal' it calculating avaliable mana crystals incorrectly.
Example: player has 3 mana crystals. Bot plays 'Groove tender' and gain +1 mana crystal, total 4 mana crystals, but avaliable only 1 crystal.
If my hand has creatures/spells with manacost 4 - bot trying to play it until the end of the turn.