Can one eat the year-round matzah that is chametz during Nissan
Many have the minhag not to eat any matzah from Rosh Chodesh Nissan until Pesach. The poskim however say that it does not apply to matzos that are really chometz.
Chag Kasher V’sameach
M’bais Halevi 7 pg. 28, KOvetz Halachos (Pesach) 16-4, Hilchos Chag Bchag (Pesach) 1 ftnt. 15