On MacOS Sequoia, under "Other Updates", it now pre-selects "macOS Tahoe 26.2" instead of the macOS Sequoia update.
These were the pre-selected checkboxes when I opened the dialog:
https://ibb.co/GfMw9ghL
They hide Tahoe it in the summary text too:
https://ibb.co/wZWb46CV
So to continue receiving updates for Tahoe, you have to now select the correct checkboxes.
This is really sneaky.