Both of these bugs affect life domain cleric only, presumably because bless is a domain spell for them.
1. Bless level 2 should affect 4 targets, but only affects 3 ( Life domain only ). 2. Mystra's blessing buff is not granted when casting bless with staff of arcane blessing ( Life domain only ). This was tested both with the regular version of bless, as well as the bless provided by the staff.