Ever since updating to iOS 14 there are times when the imessages only show up on one device usually my iPhone... and if i open messages on my iPad the same thread will be missing texts...and then randomly it will update and show everything that was missing. It’s frustrating because I’ve never had this issue with imessage threads not being in perfect sync at all times. They’ll be times im on the iPad using it and receive nothing...only to then grab my phone and see that there are messages that I received. Hope that makes sense... Ive read up and tried different things including logging out and back in with my Apple ID on both devices as well as turning iMessage off then back on on each device as well...Thanks