many (if not all) works attributed to Placidus Pichler are actually the works by Pichler,_Johann_Melchior
See Studi Vivaldiani 17 page 73-75
page 74: "Placidus Maria Pichler (1722-1796),a German-born priest and organist who has undeservedly become the ostensible author of some of Johann Melchior’s works through numerous mistaken attributions."
Among other things it states (page 75) that not a single work exists by Placidus Maria Pichler himself ("While Brunner lauds the virtuosity of Placidus as a musician, on both the organ and the “chelys”,he acknowledges that not a single composition is known to exist from his subject’s pen.")