Conditionnal Update Action is never execute

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I cannot figure out why an Update Action is never execute.

I created a simplest debug Apps to make tests about that. Here a link to clone it:

Functionnality:
A list of Clients that the login user can add Notes about.

Implementation:
An Icon “+”

  • Create Note Action
  • Update an hidden field “IsNewNote” to TRUE
  • Link to a modal screen (with the IsNewNote" field") to write the note.

An Icon “Edit”

  • Update an hidden field “IsNewNote” to FALSE
  • Link to the modal screen (with the IsNewNote" field") to write the note.

The Note Screen have 3 inputs (TitleNote, DetailsNote and IsNewNote that will be hidden later) and 2 buttons: “OK” and “Cancel”.
OK Button

  • Update the TitleNote and DetailsNote
  • CONDITIONAL Update the LastUpdatedBy IF IsNewNote = FALSE NEVER EXECUTE (my question)
  • Link back

Cancel button

  • CONDITIONAL Delete Current Note IF IsNewNote = TRUE EXECUTE ONLY IF TRUE… all OK then
  • Link back.

Do you have any ideas why I got this behavior? Thanks!