According to support, (support) leadership has passed down to agents that there was a change in July to split-billing for third-party-billed subscriptions. This affects, for example, those who get Hulu through Spotify, T-Mobile, DirecTV. It also seems to affect those who get Disney+ bundle through Kroger Boost.
All in all, this is a huge mess. Their public FAQ has not changed and still indicates that 3rd-party-billed subscribers should be getting their adjustment credit if they sign up for a bundle: https://help.disneyplus.com/article/disneyplus-existing-disney-hulu-espn (Note, the asterisk has to do with the ability to upgrade the bundle through the third-party biller and is irrelevant to this conversation.)
They clearly have not communicated (successfully) this change to support agents who still to this day are telling customers that this is a glitch whereas others are saying they have specific instructions that this is intended. To make matters worse, it appears the specific instructions, if they do exist, are to make it clear that this is a change to do with people getting these services "for free." However, this is not universally the case: for example, T-Mobile allows you to buy Hulu through them, and you would be paying the same amount as you would directly to Hulu. Of course, agents have basically been trained to just say that expecting a discount when you are getting something "for free" is wrong...
The only emails anyone seems to have gotten have been about "duplicate subscriptions" and a link to an entirely irrelevant FAQ page. There is no notification otherwise that this billing adjustment is going away and should not be expected going forward. Many people have been unexpectedly hit with this systemic change.
Support also acts like this is some sort of edge case, when in reality, this adjustment for combining subscriptions with split-billing has always been an integral part of their bundles and platform. It is truly shameful how this has been handled, and there is still no clarity or publicly-facing information.
This leaves people in a position where:
There is no notification of a change in price, and people are getting charged more than expected.
There is no public information regarding this change.
Support agents cannot be trusted to give the correct information. Depending on who you get, you might get a different answer.