Old Private Comments show "This content has been hidden from site admin" after recreating user

I'm experiencing a strange issue with the Private Comments addon.
I'm using LearnDash with wpDiscuz Private Comments.

A user was accidentally deleted and later recreated with the same email address.

Example:

• Old user ID: 124
• New user ID: 654
• Same email address
• Same username

I updated all old comments in the wp_comments table so they now reference the new user_id.

I also verified that:

• comment_type = private
• comment_parent = 0
• comment_approved = 1
• course_id in wp_commentmeta is identical to newly created private comments.
• Old and new comments are otherwise identical.

Current behavior:

• All new private comments work correctly.
• All old private comments display:

"This content has been hidden from site admin."

This happens:

• while logged in as Administrator
• and even when logged in as the recreated user himself.

The comments are not lost.

In the WordPress backend I can edit them normally and see their full content.

There are no custom wpDiscuz database tables in my installation, only the standard wp_comments and wp_commentmeta tables.

Is there any additional metadata, cache, or internal mapping used by the Private Comments addon that may still reference the old user?

Or is there a repair/synchronization procedure for old private comments after a user has been recreated?

Thank you!