You can use M-x semanticdb-dump-all-table-summary to see the list of databases that will be searched from a given buffer. You can follow up with M-x semanticdb-find-test-translate-path to then make sure specific tables from the path are discovered correctly. Alternately, you can get a list of include files Semantic encountered, but could not find on disk using M-x semanticdb-find-adebug-lost-includes.
Dump a list of all databases in Emacs memory.
Call and output results of semanticdb-find-translate-path. In
the displayed buffer, you can type SPC to expand items. With
arg non-nil, specify a brutish translation.
Translate the current path, then display the lost includes.
Examines the variable semanticdb-find-lost-includes.
Lastly, you can test an explicit search term using this command:
Search the semanticdb for regex for the current buffer. Display the results as a debug list.