How to repair a corrupted Public Folder (on-prem)

Hello guys,

Hope all is well.

In our Exchange 2019 environment we use Public Folders extensively. Everything seems ok except one of folders that looks corrupted.

I can execute commands Get-PublicFolder / Set-PublicFolder against it, I can get its items statistics (Get-PublicFolderItemStatistics) and have access to items through Outlook. But commands Get-PublicFolderStatistics, Get-PublicFolderClientPermission return the same error:

The security principal specified is already on the permission set.
    + CategoryInfo          : NotSpecified: (:) [Get-PublicFolderStatistics], CorruptDataException
    + FullyQualifiedErrorId : [Server=E7,RequestId=b2f89187-878f-4cab-b05f-fcdaa7d82c0d,TimeStamp=2/17/2025 3:19:42 PM] [FailureCategory=Cmdlet-CorruptDataException] B960021F,Microsoft.Exchange.Manag
   ement.MapiTasks.GetPublicFolderStatistics

I tried to repair the corresponding public folder mailbox (New-MailboxRepairRequest) but none of my requests found errors. I moved the public folder content to a different public folder mailbox, no success.

Any ideas how to fix the issue? My guess is that ACL list of the public folder is corrupted.

Regards,

Dmitry Horushin