thumbnail data sent by steam is empty - I’ve completely unsubscribed from any items on my workshop, (They remain in my folder on TTS, apparently) and upon trying to install any type of mod from the workshop, it fails to install with this issue. This hasn’t ever happened before.
I am having the same issue. I found that if I launch the game with the launch options of “-nothreading” (without the quotes), it seems to work around the issue partially.