Ahh, I see what you're wanting it to do. Unfortunately, much like our layered Photoshop import, EXR import is not architected to dynamically update the addition or removal of "layer" elements themselves.
Is it also the case that simply reloading the footage does not update?
There are many aspects of attempting to do this updating automatically that are challenging to get correct from the user's intent perspective. What should happen to exisitng Compositions when the layer structures get changed externally — particularly when new items are added?
Dont need automatic updating. If the current list of AOVs was updated by manually updating the footage, that would be enough.
Even adding the sequence again as new footage seems to retain the AOV list in extractor that the original sequence had, so AE is remembering the AOVs somehow. Only an AE restart seems to update it. (not even closing the project/reopening)