Recently Google successfully integrated MMS and SMS into its Hangout app for Android which was replaced by Talk. This change and improvement is only done in effort to position it as the new all-in-one messaging platform for your Android device. A long time ago, this roll-out had several bugs with MMS which denied users from sending and receiving group messages.
Speaking about current, today Google has rolled out an update to the Hangout app for Android in all good hope fixing the earlier issue. In addition to the resolved issue, there also is an update of a new option within the app to manually switch off MMS group messaging at your convenience.Hangouts for Android