In season1, some gamers use experience of bounties mission upgrade and unlock achievements. In the upcoming hotfixes, these event bounties are disabled. At the same time, the community manager also talked about the designing concept of the game season. To know more detailed information,  you can read the original post below:

"One of our ongoing goals for Diablo III (and Seasons in particular) is to promote diversity in play styles and encourage a variety of experience whenever possible. In line with this goal, and as a direct result of your feedback from Season 1, we're in the process of implementing a series of hotfixes that will temporarily disable the following events as eligible bounties:

•The Matriarch's Bones
•The Jar of Souls
•The Miser's Will
•A Miner's Gold

This change will apply to both Seasonal and non-Seasonal games. Additionally, please note that these hotfixes will only remove the above events from the active bounty pool, not the game itself. The events can still spawn in-game and will provide rewards as normal.

We don't have an ETA at this time for when these events will be re-added to the bounty pool, but are working to have them available for Season 2.

Looking Forward:

In Season 1, many players were able to quickly level their heroes and earn a coveted rank on the "Race to the Top" leaderboard exclusively by running the bounties in question. While we won't be removing any Conquest credit or ranking from players who chose to use this particular technique, we will be making changes to these bounties for future Seasons. The desire here is to help promote an environment where the most efficient way to play is also the most varied (and ideally the most fun too). With this, one of our goals for Seasonal Conquests is to encourage players to try out different tactics and explore different play styles, so we will be evaluating all Season 1 Conquests with that goal in mind and making changes for Season 2 as needed."

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