Gist embeds on posts don't display all indentation using Safari

[sandymcfadden]

This a bit edge case but tested this on a couple different themes and it only seems to happen using Safari and when gists are embedded into posts. Pages work fine and other browsers work fine.

Steps to reproduce

1. Create a new post
2. Paste the URL of a Gist which has tabbed indentation in a new block to embed
3. Publish post
4. View post in Safari

Example Gist to use https://gist.github.com/sandymcfadden/3322f161477ece5eab526bb17ec7514c

What I expected

That the Gist would display with the proper indentation

What happened instead

Lines which should be intended aren't

Browser / OS version

Safari / MacOS 10.15.7

Screenshot / Video

Example of Gist in Page

Example of Gist in Post

Context / Source

#user-report

[cathymcbride]

Interestingly, if you "view raw" and come back, the indentions fix themselves.

[rinazrina]

I got another report here: #21083114-hc