J.X: Partly for Invariata-only party — do not cling to early wording into papal species-presence sense; Naumburg 1561 preface warned
Partly it was for the Invariata in particular — and for those who hug that form alone while crushing and wiping out the Variata.
If they cling too superstitiously to the earlier wording, they can be pushed into the papal phrase about Christ's Body and Blood present in the Supper under the species of bread and wine, in the sense the Western Church alone then held when the Confession was issued.
The Imperial Estates at Naumburg in 1561 already flagged that danger in the preface they set before the Invariata and addressed to Emperor Ferdinand.
Latin
Partim in gratiam Invariatae Confessionis in specie, hancque solam & cum oppressione ac exterminio Variatae, amplectentium, ne, dum nimis superstitiose verbis prioris inhaerere satagunt, ad phrasin Pontificiam de praesentia Corporis & Sanguinis Christi in Coena sub Speciebus panis & vini, hujusque phraseos sensum, eo tempore, quo Confessio edebatur, Occidentali Ecclesiae unice receptum, adigantur, id quod metuendum fuisse jam olim innuere Status Imperii, Naunburgi Anno 61. congregati, in praefatione sua, Augustanae Confessioni Invariatae praemissa & Ferdinando Imperatori inscripta;