Hello,
We apologize for the issue you are facing with the Slack link previews. It seems that the Slack Enhanced Sharing feature is automatically including metadata such as Author and Time to Read for your core pages, which you do not want.
To manage this, you can disable the Slack Enhanced Sharing feature for specific post types or pages. Here’s how you can do it:
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Navigate to Titles & Meta Settings: Go to Rank Math SEO → Titles & Meta Settings in your WordPress admin area.

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Enable/Disable Slack Enhanced Sharing: Scroll down to find the Slack Enhanced Sharing option. You can toggle this setting to enable or disable it according to your preferences.

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Save Changes: Don’t forget to click the Save Changes button at the bottom of the page to apply your settings.

If you still do not see the option to disable these tags, please ensure that you are using Rank Math in advanced mode. If the problem persists, please reply to this ticket with your site URL so that a human agent can assist you further.
Thank you for raising this concern, and we’re here to help!
Sources:
How to Enhance Sharing in Slack » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.