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Power Apps - Power Apps Experimental Features
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Bug - when editing Formulas, App Checker reports false error

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Posted on by 4
This feels like a bug to me, and I don't know how to report it.  This seemed like the best place to post it. 
 
I have an app that has grown to a decent size.  I'm making use of User Defined Functions in it, which is a Preview feature.  The app has got to a point that any time I make any change to the Formulas property, the App Checker reports an error, but the error is a false positive. I've created a minimal app to reproduce the bug.  I've attached the .msapp file to this question. 
 
App Formulas looks like:
 
fnSetTabList():Void =
{
    ClearCollect(
        varTabList,
        {Value: "Foo"}
    )
};
fnAllFormsAreClean():Boolean =
{
    true
};
 
The fnSetTabList function is called in OnStart.  My screen is very simple, here's the yml:
 
Screens:
  MyProfile:
    Properties:
      Fill: =RGBA(245,245,245,1)
      LoadingSpinnerColor: =RGBA(56, 96, 178, 1)
    Children:
      - TabList1:
          Control: TabList@2.2.30
          Properties:
            BasePaletteColor: =RGBA(5, 102, 178, 1)
            Items: =varTabList
            OnSelect: |-
              =fnAllFormsAreClean();
              Set(
                  varCurrentTab,
                  TabList1.Selected.Value
              );
            Width: =Parent.Width/1.5
            X: =20
            Y: =20
 
If I edit the Formulas property - even a simple edit like just adding a space - the App Checker reports:
 
'fnAllFormsAreClean' is an unknown or unsupported function.
 
That's a false error because fnAllFormsAreClean definitely exists.  I can clear the error by either CTRL-A, CTRL-X & CTRL-V in the formulas field, or by doing any edit ( like adding a space ) to the OnSelect property of the TabList1.  
 
Additional information:
  • If fnAllFormsAreClean comes before fnSetTabList in the Formulas property, the problem does not occur
  • If fnSetTabList does a Set(varTabList,[{Value: "Foo"}]) instead of ClearCollect, the problem does not occur
  • If I remove the Set(varCurrentTab,...) statement in the OnSelect of TabList1, the problem does not occur
This example is greatly reduced to try and figure out the crux of the issue. 
 
I would appreciate if someone would take the time to load the attached msapp file into their own environment and see if the issue happens for them.  If it's reproduceable elsewhere, I'd like to report this bug to Microsoft.  Is there any way to do that?
 
  • TM-28062113-0 Profile Picture
    4 on at
    Bug - when editing Formulas, App Checker reports false error
    @stampcoin - thank you for your reply.  i tried as you described
    • turned off User-Defined Functions, saved the app & reloaded
    • turned on User-Defined Functions, saved the app & reloaded
    the issue still is true for me - any changes to the Formulas field has the App Checker reporting that fnAllFormsAreClean is unknown. 
     
    for you, does the App Checker no longer report the error when you change the Formulas field?
  • stampcoin Profile Picture
    2,359 on at
    Bug - when editing Formulas, App Checker reports false error
    I tried this one.
    It did like you said, I tried to remove a space in the function 'fnAllFormsAreClean'.
    And I switched off the preview feature, save and switched it on. seems everything is back to normal.
     
  • TM-28062113-0 Profile Picture
    4 on at
    Bug - when editing Formulas, App Checker reports false error
    Thank you @mmbr1606, but the support in Power Apps is not helpful.  It's just Copilot trying to give solutions which are not helpful.  It may be because I'm not a delegated admin in my environment, but the "Support" and "Contact" tabs are disabled.  So, I cannot report the bug there.   
  • Suggested answer
    mmbr1606 Profile Picture
    12,933 Super User 2025 Season 1 on at
    Bug - when editing Formulas, App Checker reports false error
    hey
     
     
    if you feel like it is a bug you can report it in the support section of power apps.
     
    If my answer was helpful and it solved your issue please mark it as verified answer. If it helped but did not solve please consider giving me a like :)

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