my site title was with 2 words, after updating there was only one word.
if i added two names it did not save.
my solution was: i have changes the oneward with a letter. this saved it. then add the second word. voila. it works.
very strange bug.
when i’ve changed another general field (e.g. email), the site title was again only one word. but i could change the title again to be correct.