Created attachment 14993
Screenshot VE compared to old preview

Attached:

See T72123

I found an unusual example of this in an infobox today:

This is easily reproduced at https://en.wikipedia.org/w/index.php?title=Tetulomab&oldid=698223500&veaction=edit

The red "Type" item is actually a link to https://commons.wikimedia.org/wiki/File:Engineered_monoclonal_antibodies.svg

These are probably also duplicates? (or merge-target)

• T72123: VisualEditor redlink detection should obey Title::isAlwaysKnown (so that links to Special pages, EducationProgram pages and GlobalUserPages render correctly)
• T134073: Page curation toolbar should show blue links when there is a global user page

See also, notes from Legoktm and Jdforrester-WMF in:

• T88644: Caching and batching of "known" link status and other link info

In T65355#2517538, @Quiddity wrote:

These are probably also duplicates? (or merge-target)

• T72123: VisualEditor redlink detection should obey Title::isAlwaysKnown (so that links to Special pages, EducationProgram pages and GlobalUserPages render correctly)

This task is a dupe of that indeed. Foreign files such as Commons is just one of many things that Title::isAlwaysKnown takes care of, in addition to Special pages, MediaWiki messages, and extension hooks such as for GlobalUserPages.

• T134073: Page curation toolbar should show blue links when there is a global user page

That's a similar issue indeed, but in Page curation. That will needs its own fix separate from VE.