The bingo tasks do change when you progress between the leagues. I think clearing and expanding is only available in the lower leagues (eg. Timber). Since moving up in the leagues I no longer get these and have resolved to expand out and clear all my land to improve performance in my game, instead of saving foliage for these tasks. Crafting gems was also more common up to Silver league, but I can't remember seeing one in a while now that I'm staying in Gold league. Mining tasks are still available in Gold league but the last round I didn't really see any. Every card only ever has two tasks to breed a specific dragon type and these tiles will always come up with another breed task no matter how many times you refresh.
I could be wrong tho, since bingo is still relatively new and I've not let myself drop down to Timber again. Can't really say if they changed it across the board in recent rounds.
I'm certain that these probabilities of getting certain tasks do change over time, and in the last 3 or fours hours when I was flipping new bingo cards I did notice a lot more breeding tasks on the new card. Seems like S8 make it a bit harder to bum rush the leaders with gold at the very end, which is actually fairer to normal players. You can still do it, it will just cost you (which is mighty fine for S8 too). Good thing the competition is easing off these days, I managed to snap 50 tickets for under 100 gold (in total over the bingo round including boosts) this time around. A last minute 2000 point jump to a 1000 point lead was enough to discourage would be pursuers.