There seems to be a problem with non-ASCII characters in languages other than English.

I can't edit text with letters such as the Spanish (ñ) (Ñ) or accented letters (á) (é) …

This appears to be an issue not only in the browser but also when using copy and paste from a text editor.

Additionally, linked text and tags like "#diseño" get split into something like "#dise // ño // ño," repeating after the (ñ) letter.