Doesn't look like it. Browsing through lists of BR release dates and watching some openings, the last BR with "Produced by Leon Schlesinger" was "The Fella with the Fiddle" from January 1945, and the next one was "When I Yoo Hoo" from February and it had "A Warner Bros. cartoon". Perhaps they prepared the reissue titles before Warner Bros. took over the studio and by the time more of these films were needed, the notice had already changed to "A Warner Bros. cartoon".