Was Nazi-looted art concealed from Jewish heirs?

Artworks by Paul Klee and Pablo Picasso were among hundreds in a Bavarian state collection that were knowingly stolen by the Nazis. Yet descendants of Jewish owners were never informed.

source https://www.dw.com/en/was-nazi-looted-art-concealed-from-jewish-heirs/a-71745982?maca=en-rss-en-ger-1023-rdf