Heading Numbering Issue Remains After Fix

Question

I had the same issue as many in Word following the update to version 2512 where heading numbering disappears when a style separator is used. (Note that the numbering does show correctly when Track Changes is enabled.) Following the the updated to Version 2602, the issue was temporarily corrected, however, the problem has just returned exactly as before.

I have verified that I am fully updated and have restarted Word from scratch several times.

Throughout my Word documents, heading numbering continues to disappear where a style separator is used.

Is there an updated fix? Would uninstalling and reinstalling Office 365 from scratch help?

For reference, here's the initial issue:

https://support.microsoft.com/en-au/office/heading-numbering-disappears-after-applying-style-separator-in-word-535fed39-64eb-4ac1-a2c6-48f15dfd5ed5

Answer 1

The heading-numbering issue with Style Separator in Word version 2512 (build 16.0.19530) and later is a known bug that Microsoft has marked as fixed by a service change.

The documented guidance for users who still see the problem is:

1. Close all open Office apps (Word, Outlook, etc.).
2. Re-open Word so the service-side fix is picked up.

The support article does not document any additional client-side fix steps beyond fully updating and restarting Office. It also does not mention uninstalling/reinstalling Microsoft 365 as a remediation step, and there is no documented evidence that reinstalling Office would provide any extra benefit over closing all Office apps and restarting Word to pick up the service change.

If the issue persists after confirming:

• Word is on a build at or beyond the fixed level, and
• all Office apps have been fully closed and Word restarted,

then the next step is to treat it as a regression of the same known issue and open a support case or post in the Word community so Microsoft can collect logs and update the public article if needed. The current public status remains “FIXED” with the restart requirement as the only published action.

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References:

• Heading numbering disappears after applying Style Separator in Word
• Fixes or workarounds for recent issues in Word for Windows
• Multi-level numbering in Word - Microsoft Q&A
• After upgrading to version 2512 (build 16.0.19530) or later, users may find that heading numbering disappears when a Style Separator is used. - Microsoft Q&A
• Using style separator is causing the numbering to disappear when in Print Layout view - Microsoft Q&A