Uhm, working for me. Those links are within parentheses, and pipe-separated.

I'm using english and vector - https://en.wikipedia.org/w/index.php?title=User:Michael_Charles_Rockefeller&action=edit&redlink=1&safemode=1&uselang=en&useskin=vector

When viewing message names (uselang=qqx), I see:
14:14, 19 (july) 2019 (logentry-delete-delete: CambridgeBayWeather (talkpagelinktext) (contribslink), CambridgeBayWeather, User:Michael Charles Rockefeller) (parentheses: U2: Userpage or subpage of a nonexistent user) (parentheses: (thanks-thank: DannyS712, CambridgeBayWeather))
18:53, 18 (july) 2019 (logentry-move-move: Emilie2606 (talkpagelinktext) (contribslink), Emilie2606, User:Michael Charles Rockefeller, User:Emilie) (parentheses: (revertmove)) (parentheses: (thanks-thank: DannyS712, Emilie2606))

What should be shown is: (parentheses-start)(talkpagelinktext) (pipe-separator)(contribslink)(parentheses-end)

In T228565#5351019, @DannyS712 wrote:

I'm using english and vector - https://en.wikipedia.org/w/index.php?title=User:Michael_Charles_Rockefeller&action=edit&redlink=1&safemode=1&uselang=en&useskin=vector

Still working for me with this link.

What should be shown is: (parentheses-start)(talkpagelinktext) (pipe-separator)(contribslink)(parentheses-end)

Yep, I'm seeing that.

Maybe it could be some userscript/style?

Nope, I set safemode=1

This is basically T220767: Some special pages are not properly displaying parenthesis and other seperators around user links.
https://gerrit.wikimedia.org/r/#/c/mediawiki/core/+/505326/ probably needs another followup patch.

I can reproduce this on https://en.wikipedia.org/w/index.php?title=User:Michael_Charles_Rockefeller&action=edit&redlink=1&safemode=1&debug=true&useskin=vector and https://en.wikipedia.org/w/index.php?title=User:Michael_Charles_Rockefeller&action=edit&redlink=1&safemode=1&debug=true&useskin=timeless

@Aklapper and there is also T224650: Parentheses and pipe separators missing on Special:AdvancedReviewLog that I opened over a month ago that is still happening

In T228565#5351018, @Daimona wrote:

Uhm, working for me. Those links are within parentheses, and pipe-separated.

That's weird. I confirm what @DannyS712 says. Can you screenshot?

@DannyS712, can you verify this on enwiki beta (https://en.wikipedia.beta.wmflabs.org/w/index.php?title=User:Martin_Urbanec/sandbox&action=edit)? I can't reproduce this there. If you can't as well, this would be a dupe of T227190.

It does not happen at the link you provided. Furthermore, it doesn't happen at https://en.wikipedia.org/w/index.php?title=User:Michael_Charles_Rockefeller&action=submit&redlink=1&safemode=1 (submit rather than edit) either, so I think you're right about T227190.

Huh, it's not weird. I don't use visual editor, that's why I couldn't reproduce it.

Ah, that explains it :-).