This solution addresses the following issues experienced with migrated items in SharePoint online(SPO):
1) Duplicate fields or columns are displayed and some hidden fields are exposed in classic SharePoint UI
2) The error "Sorry, properties cannot be displayed, having error: GUID should contain 32 digits with 4 dashes" is displayed when adding/editing items in Modern SharePoint UI (PowerApps)
As a temporary workaround, a PowerShell script ("Transformer") has been built to trim some field references (field links) in content types during migration.
The Transformer and the instructions are packaged in a zip file attached to this article. Please download and apply the transformer to your migration job to fix this issue.
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