Who I have the same questioned this topic

One of the updates between Thanksgiving and January caused messages to no longer work over wifi on my 1st generation Pixel XL.  I have used my phone in airplane mode, on a plane, using wifi, or in an area with no service over wifi many times, and the last time I did this on a plane was in November.  Sine then, this is my third round-trip flight on a plane, and my phone says "no connection" with a cloud with a line through it next to that when I go into a message.  I can neither send nor receive a message while on wifi and not on the cellular network. 

What happened to cause this and why has it not been fixed?  Can someone at Verizon please clue us in/fix this?  I contacted Google, and they reached out at first, and since then, there has been radio silence. This is beyond annoying, especially if you are trying to communicate with someone regarding a ride or something like that.

Thanks.