I've not seen this elsewhere, but it looks like OLCI has actually been genuinely enhanced! This morning I found that if I check in and exit OLCI without printing a BP, when I return to OLCI I have both "Print boarding pass" and "View or change seat" options available ^
After you print a BP, the seating option does disappear, but that's reasonable enough.
If this stays and is not just some random error, then a great return of a missed bit of functionality