Why mods break after game updates: the five causes, what almost never breaks, and how to react on patch day

24 Oct 2026 · 4 min read · ModsDrop

Pictured: Red Bull X2010 – Car with Custom Physics and Updated Sounds, from the ModsDrop library.

Every big game update is followed by the same week on every mod site: a wave of “this mod is broken” reports, most of them about mods that are fine. Some really are broken, and understanding why helps you tell the two apart before you download, report or delete anything. The pattern is the same across BeamNG.drive, the SCS truck games and Farming Simulator.

Mods are patches on top of the game’s own files

A mod is a set of files that the game loads after its own. A vehicle mod adds a folder of models, textures and definitions; a map mod adds a level; a script mod adds code that runs alongside the game’s. None of it is compiled into the game. That is why installing is just copying a file, and it is also why an update can break a mod without touching it: the mod still asks for things the game no longer provides, or provides differently.

The five ways an update breaks a mod

1. A format changes

The most direct cause. When a game changes how it reads materials, the mod’s materials come out wrong. ETS2 and ATS 1.60 introduced the Improved Material System; truck interior mods built for the old system looked flat or shiny until their authors re-exported them, and 1.62 extends the new system to the Iveco S-Way and the Volvo VNL, so those interiors are next. Vehicles, trailers and skins that do not define materials of their own were untouched.

2. A base file the mod overrides is rebuilt

Map mods are the classic case. A map mod edits a region of the official map. When the developer reworks that region (the UK rework in ETS2, the earlier Germany and Austria reworks), the mod’s edits point at roads that no longer exist, and the result ranges from a floating junction to a crash on load. The mod’s own files did not change; the ground under them did. Any map mod covering an area that is being reworked will need an update when that rework ships.

3. A code function is removed

Script mods call functions the game exposes. Farming Simulator 25 patch 1.24 disabled Lua’s loadstring; every script mod that used it stopped on the spot. BeamNG 0.40 removed the v-bng-panel UI directive and deprecated createVueApp; HUD app mods built on them fail, while vehicle mods carry on. Developers announce these removals in the changelog, which is why the changelog is the first thing to read when a mod stops working on patch day.

4. The game adds a check that the mod fails

Not a breakage, but it looks like one. The SCS Mod Manager flags mods made for an older version with a warning; FS25’s mod screen does the same. The mod still loads if you let it. The warning exists because the developer cannot know whether the mod touches something that changed. You can know, by reading the changelog and the mod’s description.

5. The mod relied on a bug

Rarer, but real. A mod that only worked because the game ignored an error, or because an invisible ground plane sat at a certain altitude, breaks when the game is fixed. BeamNG 0.40 changed how some mod maps read the ground plane; 0.40.1 corrected the regression two days later. When a mod breaks and is fixed by a hotfix rather than a mod update, this was the cause.

What almost never breaks

Paint jobs and skins, sound mods, cargo and trailer packs in the truck games, placeables and textures in Farming Simulator, and ordinary vehicle mods in BeamNG survive the great majority of updates unchanged. If a report says “every mod broke”, the actual cause is usually one of the items in the “mods not showing up” guide: a new version folder, a stale cache, or one broken script taking the rest down with it.

How to react on patch day

Read the changelog’s modding section. Removed functions and format changes are listed there.
Start once with mods off (Safe Mode in BeamNG, a fresh profile in the truck games, an unticked list in FS25) so you know the game itself is healthy.
Enable mods in groups: content first, maps second, scripts and UI last.
Give authors a week. The ones who are active usually ship a fix within days of a major update; a mod that has not been touched in a year will not get one, and that is worth knowing before you build a save around it.

For uploaders

State the game version you tested on, and when a patch changes it, update the description even if the file did not change. “Still works on 0.40.3” saves your downloaders a test and saves you a report. On ModsDrop that line lives on the mod’s page on crashmods.com, linked from the file.