Markdown .TableOfContents ignores strikethrough in headings

[legends2k]

Strikethrough text in headings seems to be stripped out and only the text is output by .TableOfContents.

Tested in Hugo version: v0.79.1
Source format of content: markdown

I've a heading with strikethrough (e.g. ~~world~~) like this

Hello world

which renders with a strikethrough in normal page rendering. However on the TOC list I see

Hello world

Live example

[legends2k]

Headings with inline code and italics, however, are shown properly in TOC.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. The resources of the Hugo team are limited, and so we are asking for your help.
If this is a bug and you can still reproduce this error on the master branch, please reply with all of the information you have about it in order to keep the issue open.
If this is a feature request, and you feel that it is still relevant and valuable, please tell us why.
This issue will automatically be closed in the near future if no further activity occurs. Thank you for all your contributions.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.