Sorry if this is not a bug, or FOIG, but I believe it to be unintended.
Upon level 4 and beforehand, my parrot familiar was able to cast eagle's splendor once a day, and color spray once a day.
Upon level 5 and thereafter, my parrot is able to cast eagle's splendor zero times a day, and color spray twice a day.
This seems unintentional to me. If not, then please ignore/delete this.