View rendering multiple translations as the same translation (latest revised translation)

Encountered the same problem. Filed another bug 🐛 Static cache in FallbackController service does not consider langcode Closed: duplicate which I closed after finding this. As we came to the exact same solution, I also add my RTBC here. Please consider this for the next release as it is really hard to track down.

Applying patch #2 made all operations links/bulk operation checkboxes in our views appear "broken/missing handler".
Removing the patch made it work again we can't use it like this but we don't have time to improve the patch now or investigate more on this.

The patch #2 is completely unrelated to views. The change is very atomic and does not influence other modules. There is probably another problem in your specific setup.