When Mountain Pass is in play and a Province is bid, it seems like the bots don't bid on it.
It doesn't show in the logs and I get the VP tokens each time.
Because there is nothing in the log I don't know whether the bots don't bid or it just doesn't show in the logs.
The bots bid, you can see that by bidding low like 4 debt as a test. I think it will be some number between 8-12, IIRC. But you are right, it isn't logged :(