You are right about the use of capitals on the cover.
The album title is taken from the disc, and it uses lower and upper case. I always describe albums from info. on the disc if possible, with variations on cover/spine, etc., noted.
The title on cover is written in capital letters, while on back cover and disk it isn't.. and technically speaking the transcription of WEISSER is "weißer" (according to German rules). ... But I agree with you nevertheless, because search function is an important point and often "ß" would be searched for with "ss", esp. by non-German speakers ... What is more, lol, there has been an orthography reform during the last 10 yrs in Germany and they tried to better standardize the use of "ß" / "ss" but it produced, by and large, more chaos and uncertainty than before :) ...
We should transcribe ß or ss as found on item for online searching and for accuracy. There is no capital form of the letter/letters on this item. Since both forms appear, one on disc, and one on cover, both can be transcribed.
A system could require that alternate spellings be supplied for each form, but that goes against the principle of keeping rules for descriptions in 45Worlds as simple as possible.
Different search results are seen in just in 45Worlds, a relatively small database, for the differences in spelling, so they should be observed.
Umlauts (ä, ö, ü) and their alternative forms (ae, oe, ue) also cause problems for transcribing and searching, but that is the nature of the German language.
"ß" is in German always rendered as "SS" if capitals are used (because there is no capital form for "ß"); "Weißer" and "WEISSER" are therefore identical :) -- In older times, "ß" was commonly rendered in capitals as "SZ" but this has since long been abandoned.