Apparently TF2 added a "community-generated" map last week that was not only broken itself, it broke other maps too, causing game crashes.

The issue was a model of a row boat that was added to the official game in 2009. cp_premuda was added to the official game in July, 2026. But Premuda is a lot older than that, and it references a version of the row boat model that is older than what was added to the game in 2009.