Unknown Sender in Android Messages

[gonecks1]

Just today after I restarted the phone, Android Messages started showing some conversation threads as Unknown Sender instead of the contacts name. In some of these threads the contacts initial icon will be there and it will link to their contact info. Also, at the very bottom of the thread is "sender does not support replies"

Any clue what's going on? Thanks

 

[LilOsolo Official]

Same but on different device. The text I got came with a download attachment. Suspicious