The following search should return Mark 14:22 along with Mark 14:24, but in the NA28 (and the NA28 from the German Bible Society) it doesn't. Search finds it in other Greek bibles I have.
lemma.g:οὗτος BEFORE 4 CHARS lemma.g:εἰμί (see below, I searched in Mark 14)

I also noticed that my OpenText bible doesn't show vv. 22 or 24, so I get no results in this bible when I search Mark 14.

Changing the search to the following fixes the problem for both NA28 bibles, but not for OpenText:
lemma.g:οὗτος BEFORE 1 WORD lemma.g:εἰμί

Can someone explain what's causing this? Are the footnotes/sigla in the text interfering with the search function? Is Search counting the footnotes as characters?