What happened to all the camera transforms and ACEScc?

I'm using this config as an environment variable, with Blender. I just replaced the OCIO studio config file from last year with the latest studio one, and to my surprise I found a greatly reduced list of camera colour spaces, and no ACEScc. What happened? Is that intentional or the result of an issue on my end?

Compare the previous studio config file with the latest studio config while reproducing the setup through the Blender environment variable. Determine whether the reduced camera colour spaces and missing ACEScc are intentional; done means documenting the cause or identifying a reproducible configuration issue.

Written by the indexing model from the issue text.