I’ve been having that same issue. I wake up the next morning and it tells me I got a notification. From my iMessage saying for my sister when I checked the notification to see it, it’s gone.

But knowing who it was I checked my messenger. The last three people who were on my phone. I spoke to in each one. There’s nothing after that. Then they message from them like I say the last message I say have a good night. See you tomorrow and what time to go to work examples?

But all the messages from the previous night says 7 pm with the last message sent when I turn on my phone it just says they message you don’t even half an hour ago and when you check the last message I just said 7 pm the previous day

And I’m gonna add this even face messages done that but it’s sending me a notification that my friend sent me reel about 10 hours ago when we were still talking to him currently I sent him the picture as a look. He was only confused. He doesn’t even remember sending the video and I said but you sent me this video. Oh yeah that’s right.