So I can verify that there seems to be an issue/difference with Lucee 6 reading a cfc inside a .lar file.
A quick workaround is to unzip the cfc-archive-cfspreadsheet.lar file and then switch the Component Mapping in the Lucee admin from “Archive” to “Resource”:
Change to this:
Do that and you’re good to go… I filed a bug with Lucee: LDEV-4772
The only reason I even used a .lar in the first place when Railo forked to Lucee was that it was the only way to overcome some server v. web context issue that likely no longer exists. As I mentioned before though, I just haven’t had the time to properly refactor this project…