I am pretty sure the fourth to the last letter in these two words is simply an old form used for beta, and here the printer in the errata has confused a ligature for one of the sigma combinations, but those of you like @Phil D. who've dabbled, what do you think? The printer messed up all around. The original error was ἐκκλεσιαν and the correct reading at Acts 14:23 is ἐκκλησίαν; so I'm not sure what the printer was thinking in not only giving the original error wrong, but also the correction, unless, like I say he confused one of the sigma combinations which looks like this beta but without the upper small circle or even the hook as in the second word, which simply is not a full strike I think rather than another form. See the old ligatures in this old thread: https://www.puritanboard.com/threads/the-ligatures-of-early-printed-greek.95122/ and here even older: https://www.puritanboard.com/threads/help-with-old-greek-font.72681/#post-929022