Bug in customButton in textEditor

[JonathanOJ]

When I use these custom buttons as the documentation exemplifies, it works fine, but when I export the html after adding some label to the text it doesn't update the html, only when I export it for the second time the html is updated.

This is my custom button:

This is when i add the tag [REMETENTE.NOME]:

And when I export the html, this tag does not appear in the html: