The pict-log showing the meeting of the three Legions has no sound, and the cutscene when I met them in person had no sound.
In fact no pict-logs have had sound so far, and the cutscene with the daemonhost while fetching the Tarot was also silent.
Xbox One X
It almost seems like the game isn't accessing their voice lines.
That's what they're called in the game, or possibly pict-captures. The first one you find on a corpse on the Martyr and it is a short video of the first Hell-beast. The second you receive when the female Inquisitor contacts you and sends you to investigate the disappearances on Aethon Prime (side note - these missions actually take place on a different planet in the Aethon system) and is a a video supposedly captured by an infiltrator that features a shot of three ships approaching a planet and then cuts to a Word Bearer, an Alpha Legion marine and a Black Legion marine having a conversation. These videos play in an in-game window and are then available to replay from my Journal as clues but still have no sound.
I am assuming they should have sound because the note in the Investigation says that they "talked about" an artifact. It is not just a soind issue as no subtitles appear either. This appears to be the same bug noted in a Steam forum post of August 2018 which had a dev response that they were aware and working on it.
May I ask how you meant 'pict-logs'?