That definitely is a bug, both items should show up in the list. I'll test and see what is going wrong there. Thanks for the example.
Note: "tem" would not generally be a good subword pattern for "Item" when searching using the stone skipping technique. You get away with it in this case because it is the first subword, and we have a special case for short identifier prefixes (like Polish notation). In general, stone skipping on word boundaries means hitting the top of the wave, that is, the first letter needs to match, you can't drop into the middle of a subword. The "pure stone skipping" technique would allow that, because it ignores subword boundaries, as would the "Simple substring matching" that Clark suggested, but that is not a very powerful technique because it can't complete identifiers using acronyms.