Why doesn't [se] always get replaced?

Question

If you place the [se] magic link in a certain position, why doesn't it resolve to Stack Exchange?

Make a comment:

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa[se]aa[se]

And it shows:

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaStack Exchangeaa[se]

Note the one [se] that wasn't replaced.

See this comment for a few more positions where this happens.

Answer 1

That's because the whitespace enforcement gets into the way, and frankly – I don't care. A magic link that appears inthemiddleofaridiculouslylongword[se]likethiswherenobodywouldeveractuallyputit is not a realworld use case. If anything, we could just not expand magic links at all if they don't appear as their own words. Outside of the context of sandbox test, a comment like this would be considered abusive anyway.