User channel may be created twice is subscribeTo* function is called sequentially

[kiootic]

Reproduction steps:
Call subscribeTo* functions like:

container.chatExtension.subscribeToMessages(in: conversation) { event, message in () }
container.chatExtension.subscribeToTypingIndicator(in: conversation) { indicator in () }

Expected result:
only one user channel is created and subscribed to

Actual result:
often two user channels are created