iOS 14.7 and earlier: Unable to send SMS text message (not iMessage) without deleting a conversation, if previous messages were iMessage and iMessage is disabled after initiating that conversation/ sending few iMessages.
Expected behaviour:
If a conversation is initiated with iMessages (blue bubbles) with any contact, and the user wants to continue the same conversation using SMS messages (green) instead of iMessages, the iOS Messages app should permit it. The conversation should continue using SMS even if the earlier messages sent in it were iMessages and not SMS messages (Green bubbles). There should be no need to delete the existing iMessages conversation in order to send an SMS message (green bubbles) to the same contact if iMessage has been disabled subsequent to sending an iMessage.
Observed behaviour:
If subsequent to initiating a conversation by sending an iMessage, the iMessage is disabled in iOS Settings > Messages > iMessage > [Disabled], and an SMS text message is attempted in the same conversation, the sms sending fails. SMS text message does not get sent. Instead ot generates error “Message Failed to Send” or “Cannot Send Message”.
If a conversation is initiated with iMessages with any contact, then the user is forced to continue that conversation only using iMessages and not by SMS text messages.
