The browser back button doesn't restore unsaved changes in step 2 of App Within Minutes wizard in case of invalid content

To reproduce:
1- Create an AWM app and go to step 2
2- Include a short text
3- Fill it with "Short text default &é"'(-è_çà)=1234567890°+!:;,*ù$^§/.?µ%£¨<>~#

{[|`\^@]}¤ "
4- Use the configure option
5- Fill the Short text name with "&é"'(-è_çà)=1234567890°+!:;,*ù$^§/.?µ%£¨<>~#{[|`^@]}

¤ "

Nothing wrong with the Short text default filed. It breaks only when filling the Name.

Page after validation of the properties:

• Error message:
  Property names must follow these naming rules:
  Names can contain letters, numbers, and the following characters: "., -, _, :"
  Names must not start with a number or punctuation character.
  Names must not start with the letters xml (or XML, or Xml, etc).
  Names cannot contain spaces.

Effect:
I've lost all my modifications and i have to use the back button of my browser

Tested on XE 3.5 on my local machine

EDIT: When this string is use with the name of a textfield type => Test export PDF.TestexportPDFClass_0_longText1: Exception while parsing HTML