"Read Receipts" turned on but messages only show "Delivered" despite having been read
My wife is experiencing an intermittent issue with iMessages on her iPhone 11: she has "Send Read Receipts" turned on, but messages that I and others send her still show as "Delivered" even after she's read them and replied. We've tried rebooting her phone and turning "Send Read Receipts" off and back on again, but the issue persists (intermittently). Has anyone else experienced this? How is this possible? What could be causing this?
Thanks!
Chris
iPhone 11 Pro Max