Opava turned back to Troppau in 1938 when the German army marched in, and remained so till 1945. But I do not know any particularities from this period. I imagine that some if not most of the local Germans, who were in majority, liked it. After the war most of the German civilians were expelled to Germany, mostly to Bamberg. Maybe Franz Drescher was among them, if he was still around by that time.

With kind regards,