Cannot compile UWP project: App package... manifest validation error

Question

UPDATE

As noted in Remarks item 3 below. The following error is caused when I add the namespace xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities" and value recap in the attribute IgnorableNamespaces="uap mp recap" of project's Package.appmanifest file.

And the error goes away when I rollback the above two changes.

Original Post [Problem still exists with the addition of the above values - that I do want to add unless someone suggest a better solution]

In my UWP project of VS2017, I get the following compile error on file ...\bin\x86\Debug\AppxManifest.xml:

Validation error. error 80080204: App manifest validation error: The app manifest XML must be valid: Line 2, Column 427, Reason: System error: -2142175169.

My Package.appmanifest file:

<?xml version="1.0" encoding="utf-8"?>

<Package
  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
  IgnorableNamespaces="uap mp recap">

...

...\bin\x86\Debug\AppxManifest.xml file:

<?xml version="1.0" encoding="utf-8"?>
<Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities" xmlns:build="http://schemas.microsoft.com/developer/appx/2015/build" IgnorableNamespaces="uap mp recap build">
  <!--
    THIS PACKAGE MANIFEST FILE IS GENERATED BY THE BUILD PROCESS.

    Changes to this file will be lost when it is regenerated. To correct errors in this file, edit the source .appxmanifest file.

    For more information on package manifest files, see http://go.microsoft.com/fwlink/?LinkID=241727
  -->
....
....

Remarks

1. The error seems related to missing a namespace alias value in IgnorableNamespaces attribute. Now, in Package.appmanifest file it's ...IgnorableNamespaces="uap mp recap">. And in ...\bin\x86\Debug\AppxManifest.xml it's IgnorableNamespaces="uap mp recap build">. So AppxManifest.xml in Debug folder is generating an extra namespace with alias build. But I don't know why Visual Studio does it despite the fact that I've not declared in Package.appmanifest file.
2. Project was compiling fine before I added an extra namespace xmlns:rescap="....." to Package.appmanifest file. Moreover, even when I copy/paste the xmlns:build="...." namespace from Debug\AppxManifest.xml to Package.appmanifest I still get the exact same error
3. I tried cleaning the solution and re-compiling but same error.