Good idea! I'll add that for the next patch. 👍
Seeing no errors on that log. Do clue at all why the multiplier would stop increasing, I don't think there is any normal situation where that would happen. Might actually be that the skill triggered matches don't increase the multiplier. Everything that was coming from the top was just bricks at that point and you only kept going due to transforming em. And obviously no mobs there either to kill and increase the multiplier that way.
Damn even the brick tiles aren't enough to stop (almost) infinite combos like that with a good enough set of skills. Well it did come very close few times when almost all of the board was just bricks but you got kinda lucky with that cross transform skill.