When the language is German, the command for "commands.forceload.list.multiple" won't return the right results.
It's supposed to be "In %2$s werden %1$s Chunks dauerhaft geladen: %3$s" but instead it's giving back "In %2$s werden %1$s Chunks dauerhaft geladen: %s"
This is causing it to display messages like "In minecraft:games werden 16 Chunks dauerhaft geladen: 16" when it's supposed to display a list of all chunks that are forceloaded instead
This appears to be a translation issue and the bug tracker only handles language problems that occur in EN_US, (English, United States). In order to report this issue, please head over to the Minecraft Crowdin Project and do so.