Embedded articles unreadable in left sidebar billboards

[PhilipHow]

Describe the bug

Embedded articles in sidebar_left billboard placement are not rendered in a readable manner.

To Reproduce

1. Embed article in sidebar_left
2. View on homepage

Screenshots

[github-actions]

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[morfenza]

Hello! @PhilipHow, this bug was also reference at #20646, I've opened a PR but I'd love to hear suggestions and debate about the solution!