iMessage Read Receipts
Upgraded to iOS 15.6 and it appears that iMessage has started sending Read receipts even though the setting is turned off. I'm referring to the setting located at Settings->Messages->Send Read Receipts.
In searching, it seems this is a bug that pops up occasionally, but I can't find any definitive resolution. I have toggled the setting multiple times as well as multiple restarts of the phone, but this is not fixing the issue. I've included a couple screen captures to help demonstrate the issue.
Read receipts setting for iMessage is turned OFF: