The latest patch for the new Bridges & Ports DLC for Cities: Skylines II changes quite some stuff under the hood. This requires many mods to be updated to be compatible with the new version, even though no major changes in the Mods' code should be required.

If you're a modder yourself, most mods should work fine after recompiling again after the update, so if your mod is included in a list as "broken", it could be as simple as that.

Read more here.