I've just checked the SANE supported scanners list, and as you've noted, your scanner model is no longer explicitly supported by an open source driver (although it may be supported by a similar model Canon driver if you're lucky).
Your scanner issue is not openSUSE-specific, it is a 'Linux-wide' issue.
I have to say, this version of openSuse is a bit disappointing for this and other reasons.
If you want this fixed, you should contact the sane project people as mentioned on the page I linked to
SANE - Reporting Bugs
If you have new information or corrections, please file a bug report with as many details as possible. Also please tell us if your scanner isn't mentioned in this list at all.