To explain what's behind this; the dependency in question is one of about 70 vehicle assets I made for TRS2004 a long time ago. They had a script, written by Andi06, added to what were originally scenery-only versions to make them more usable as road traffic.
The script allowed traffic-related things, such as the float height above the road and the time when headlights would come on, to be adjusted in-game by the user. It worked quite well in TRS2004 and TRS2006, and that's why I suppose various other creators referenced them in Kind:Region assets. However, the script was broken by TS2010 and later versions. One result was that the vehicles, when still used as static scenery, would mysteriously be found sunk into the ground by a few centimetres.
I let that situation persist for about 10 years, but recently decided to rectify it by removing not only the broken AJS script, but the associated nightmode meshes and engine sound files too. My reasoning was that static vehicles do not have their engines running continuously and headlights should not come on spontaneously after dark. And removing the script does stop the sinking effect.
The new scenery-only versions are now available as TS12 assets on the DLS. Region assets that were configured to work with scripted vehicles will now see errors because they are looking for nightmode meshes that are no longer there. I guess such errors are always a possibility when creators reference other people's assets in their own creations.
A solution would be for the authors of the Region assets to issue updates with configs that no longer look for nightmode meshes, or to simply remove references to these vehicles altogether. I'm expecting angry mobs bearing pitchforks and torches to storm my building for causing errors in their Region assets!