Why is the latest Android Build ID starting with the letter A?

In the following list of _"Source code tags and builds"_ the first entry has the build id AP1A.240305.019.A1. https://source.android.com/docs/setup/reference/build-numbers#source-code-tags-and-builds I find this strange, as based on the _"Build ID definitions"_, the first letter is supposed to be the _"letter of the codename of the platform release"_, which seemed to follow an ascending alphabetical order so far. https://source.android.com/docs/setup/reference/build-numbers#build-ids-defined Out of pure curiosity, does anyone have any idea as to what caused the sudden jump to A?