[dev1206] The effects of Protect and Shell have been made mutually exclusive

[Spellbinder]

There is nothing about overwriting in the patch notes in the other languages, so I guess it was just mistranslated.

Sadly, no it wasn't mistranslated. It says the exact same thing in Japanese.

[dev1206] プロテス／シェルの効果が同時にかからなくなり、あとからかけた効果が上書きされるようになります。

The effects of Protect and Shell will not be effective at the same time... you know the rest.