Player speech transcription fails after short character responses

We’ve been noticing increasingly that when characters give very short responses (under 1.5 seconds, just a word or two), enabling microphone input doesn’t seem to work - no transcription is received (except for a “.”).

I log the transcription as it’s coming in to On Transcription Received (UE event), and when this happens, nothing comes in there while the microphone is active.

Example session ID: 0e46861a734397a0e871372475dfad5b

We’re using Unreal 5.5 with Convai plugin 3.5.1