When playing training match AI stops and won't play any cards on its turn. It happened several times on different days. Sometimes 2 or 3 times a row. I played with a Calanthe deck. It seems It doesn't caused by a specific card. It ruins the feature because there is no time limit in training match so I have to pass and quit.
Plus sometimes it plays Ge'els on the wrong row. But this is an older bug shouldn't exist since dragon drop introduced.