Who I have the same questioned this topic

Is anyone else having group messaging problems with Pixel? Regardless of what messaging app I use (3rd party or Google preloaded), responses to group messages don't download automatically (neither texts nor pictures) and are received as individual messages rather than part of a group. Sometimes the messages will download manual instantly, but other times it's taken hours. Verizon and Google tech support didn't offer much help resolving the problem (all settings are correct, tried reboot, etc...)