This is a common issue with app volumes.

First:

Try re-register the Microsoft.Windows.ShellExperienceHost and Microsoft.Windows.Cortana AppX Packages:

In Powershell:

Get-AppXPackage -Name Microsoft.Windows.ShellExperienceHost | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

Get-AppXPackage -Name Microsoft.Windows.Cortana | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

If that works, you can add those lines to shellstart.bat file  using powershell.exe -command "....."

Secondly:

Also, take a look at this post. it suggests adding

"

Basically, you just need to add this line to the snapvol.cfg on your writable template and/or existing writable:

exclude_path=\ProgramData\Microsoft\Windows\AppRepository

"

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