[Avodah] chametz post pesach

[D via Avodah]

I've never heard of the minhag but there is a chasidishe minhag to eat 
matsoh every time one washes for hamotsi during the Omer [see Chayim 
VeShoolom - Minhogim of Munkatche Rebbe] - which might be connected.
(The source is the Ari who perceives the spiritual influx of Pesach to be 
repeated over the Omer; the state that warrants the eating of matsoh during 
Pesach carries over till Shovuos. Full 'maturity' that warrants the
eating of chomets is only reached on Shovuos.)
Dovid Rubin