Enable read recipients option gone, after being there yesterday?

I can’t enable send read recipepets on a specific iMessage contact, does that mean they blocked me?

i have send read recipepts off in settings by default, but activated send read recipepts for the specific contact by clicking the i circle in iMessage when texting them.

i have send read recipepts off in settings by default, but activated send read recipepts for the specific contact by clicking the i circle in iMessage when texting them.

now a day later, my messages are sending as texts (green bubbles), don’t say delivered or read which the other day they also had send read recipepts on, and when pressing the i circle on their contact the send read recipets button is missing.

am I blocked? Or is this a bug? Any way I can know?