Thanks for doing some checking on my behalf, Jonathan. As you will well know (so I'm repeating for those that might not), manuscripts post pretty much the 1st century CE start having sound confusions resulting in spelling differences (our beloved
itacisms). The copyist of Min. 127 seems to have been pretty adept at avoiding such, with the most common itacism being the confusion of η > ει (6x in Gos. of Mark), followed by ο > ω (4χ), then ι > ει, ει > η, ε > αι, ε > η, ω > ο and η > ι (2x each), with the rest of the usual ones appearing only once. We have one instance of οι > η and η > οι, hence this rather odd non-existent word appearing is certainly a puzzle! Guess another option is the copyist was potentially working from a manuscript which had already made this error (based on some other variants, I believe the copyist was copying from another minuscule as opposed to an uncial), albeit this will be unproveable.
Interestingly our min. 127 copyist appears to have suffered from the curse of homoeoteleuton, with five long(ish) omissions in the Gospel of Mark: Mark 3:34 was originally missing due to the copyist jumping from οἱ ἀδελφοί μου in v33 to the same in v34; Mark 6:27-28 has καὶ ἀπελθὼν ἀπεκεφάλισεν αὐτὸν ἐν τῇ φυλακῇ καὶ ἤνεγκεν τὴν κεφαλὴν αὐτοῦ originally missing due to the jump from τὴν κεφαλὴν αὐτοῦ in v27; Mark 6:30 has καὶ ὅσα ἐποίησαν originally missing; the entirety of 15:28 is originally missing; the second ὁ θ(εό)ς μου was originally missing in Mark 15:34; with finally Μαρία ἡ Μαγδαληνὴ καὶ Μαρία ἡ Ἰωσῆτος ἐθεώρουν ποῦ τέθειται καὶ διαγενομένου τοῦ σαββάτου missing from Mark 15:47-16:1 due to a leap from one Μαρια to the next.
Two different correctors have replaced these missing long additions: the one I have designated corrector 3 appears to have added the Ammonian sections as well as the occasionally surrounding commentary (identifiable by the slightly different ink colour, thinner stylus, and handwriting style) and who has replaced the missing 3:34 and words in 6:27-28, and the second corrector (who has done the bulk of the 49 corrections, identifiable by the black ink used and different handwriting style) has added the missing portions of Mark 6:30, 15:34 and 15:47-16:1. This second corrector appears to have been working from a secondary exemplar, as they have corrected the smaller omissions, additions, substitutions, and transpositions in the main text of Min. 127 to readings which match the Byzantine majority. Saying that, the Gos. of Mark is predominantly Byzantine anyway (97.5% agreement before being corrected), with the final text matching it 98.55%. Interestingly, the long omissions in Mark 6:27-28, 15:28 and 15:47-16:1 all have support from Codex Sinaiticus, with minuscule 544 also agreeing with the omissions in 15:28 and 15:47-16:1. Evidently shows that even centuries apart, copyists could still make the same mistakes in the same places.

(Well, presuming these omissions weren't already present in the exemplar!)