https://xcancel.com/GrapheneOS/status/1952413110947430786
"July monthly release was not pushed to AOSP and then neither was the August monthly release. September quarterly release hasn't been pushed yet."
Not having the very tiny monthly updates pushed to AOSP is an annoyance which will delay a subset of non-security bug fixes until the quarterly releases. It's a bad change, although we know have a good idea why it happened and need the reason it happened to be reversed for them to push those again.
We've been told by multiple people at Google that the quarterly releases would still be pushed and that monthly releases are largely being phased out. However, the quarterly update was not pushed as expected on September 3rd. If it's pushed on Monday, it will be 6 days late. There hasn't been a similar delay for quarterly and yearly releases in the past.
GrapheneOS can still provide security updates but not having the quarterly release is a major problem and it's not clear why it wasn't pushed when they said it was going to be pushed.
There's a separate issue not specifically tied to AOSP impacting security patches which is what the initial part of our reply was about. See https://x.com/GrapheneOS/status/1964754118653952027 for an explanation.