Maintain support for old bubble chat and custom bubble chat handlers: throw out any plans of dropping support for pre-Roact bubble chat

[RabbyDevs (Rabby)]

See:

Migrate to TextChatService: Removing Support for Legacy Chat and Custom Chat Systems

Yup, you should be able to continue using your custom chat bubbles. The announcement states that Roblox does not mind how messages are rendered (as long as its not violating any obvious rules), instead the concern is that the messages should be sent through TextChannel objects. You can think of TextChannels as a RemoteEvent with a few extra features. You should be able to continue rendering your bubbles from a TextChatMessage object