Chat following a teleport/friends offer isn't (always) visible in the IM conversation

Description

Had an issue where I got sent a friend request that I didn't immediately accept. A few minutes later that person sent an IM to me as well, but it only appeared as a floater. The actual IM window/tab just reads "XX is typing..."

Repro:

Sender: Send a teleport offer followed by a regular text IM
Recipient: Wait for the regular text IM chiclet before opening the IM floater
-> The teleport offer is visible but the text IM isn't