No Text-To-Speech in Stable Builds on Ubuntu

Hey folks, just noticed text-to-speech has stopped working on Ubuntu 20.04 in Stable builds (v4.4 + v4.4.1 + v4.2.6). Daily builds on Ubuntu and the windows stable version work though. Any reason why this might be the case? What are some things I can try to fix this?
In the logs in the Daily build, I get Message from speech dispatcher 1 1 each time audio is heard. I get no such messages in the stable builds.