It is impossible for a BEL to have normal offspring. Every offspring will have at least 1 BEL gene. In the case some something like mocha or special they may be a bit hard to ID compared to the obvious bamboo, Mojave or lesser. But they will never have a normal in the offspring.
Every baby will be at least a single BEL gene. If there are any other hidden genes they'll show up as a combo in the offspring. Hopefully. Some can skip a breeding...
Or in the case of a het recessive... That's another can of worms and I don't think op is ready for it