This sounds like an issue with the sentence splitting algorithm.

I can confirm the bug in sentence splitting for highlighting

And when translated the link for Brown v. Board of Education becomes two links, in two sentences.

This is a bug in cxserver's sentence splitting algorithm. We are working on a mode advanced sentence splitting algorithm for MinT here https://github.com/santhoshtr/sentencesegmenter. However that is a python library. We need the same in js.

Change 961080 had a related patch set uploaded (by Santhosh; author: Santhosh):

[mediawiki/services/cxserver@master] Use sentencex library for sentence segmentation

https://gerrit.wikimedia.org/r/961080

Change 961080 merged by jenkins-bot:

[mediawiki/services/cxserver@master] Use sentencex library for sentence segmentation

https://gerrit.wikimedia.org/r/961080

Change 961979 had a related patch set uploaded (by KartikMistry; author: KartikMistry):

[operations/deployment-charts@master] Update cxserver to 2023-09-28-043003-production

https://gerrit.wikimedia.org/r/961979

Change 961979 merged by jenkins-bot:

[operations/deployment-charts@master] Update cxserver to 2023-09-28-043003-production

https://gerrit.wikimedia.org/r/961979

Mentioned in SAL (#wikimedia-operations) [2023-10-04T03:56:51Z] <kart_> Updated cxserver to 2023-09-28-043003-production (T343450, T347389, T338689)

Using the same example from T338689#9155967 which is based on the translation of a section of the Critical race theory article (quick link). The previous issues are no longer happening:

The whole sentence is highlighted:

The link to "Brown v. Board of Education" is kept as a single link (not split into two):

The above example is using Google Translate. With MinT, the link is not added to the translation, which is an issue that we may be part of a separate ticket: T348612: References moved to the end of the sentence and links disappear when translated with MinT