Render the title of a referenced issue does not work in release notes

Summary

I want to show the title of a referenced issue in the release notes text by using #1+, but the title is not rendered properly in the result, even though it is rendered in the preview.

The issue title rendering was introduced in 14.6, see

• Render the title of a referenced issue within m... (#15694 - closed)
• Documentation

Steps to reproduce

• Create a release in the release page
• Enter markdown for a referenced issue like #1+ in the release notes editor to show the title of the issue
• Check the preview - it shows the title ✅
• "Save changes" and check that the title is not rendered 🔴

Example Project

https://gitlab.com/formwandler/test1/-/releases/v1.0

What is the current bug behavior?

The issue title is not rendered in the release notes section of the release page:

The issue title is rendered only in the preview window:

What is the expected correct behavior?

The issue title is properly rendered in the release notes section of the release page.

Relevant logs and/or screenshots

See above.

Results of GitLab environment info

Also verified on self-hosted GitLab <= v15.10.