This issue was encountered in the following environment:

• MyWarp version: 3.0-beta4 (did not happen in 2.6.5)
• MC version: 1.12
• Bukkit implementation of the server: Spigot, but also happens when using CraftBukkit
• OS of the server: Windows 10
• Java version of the server: 1.8.0_131
• OS of the client: Windows 10
• Java version of the client: 1.8.0_131

This seems like an issue with handling of line endings by Java's property resource bundle...

This could be the same issue reported under #61.

This does not appear to be caused by problems within Java's handling of property resource bundles.

Instead, I suspect that this is caused by a weird behavior of MC when encountering Windows native line-endings. The line breaks in the list above are created by calling System.getProperty("line.separator") which returns \n on *nix, and \r\n on Windows. Apparently, MC does not require \r at all, even when running on Windows.

Seems to be fixed. 🎉