Irons was ill and Be Prepared was sung by Jim Cummings anyways. But still, they do singing voice/acting voice all the time. That's not the reason. Probably some shytty kid that they tested the song with got scared so they removed it cause muh babies dont like da scary
Jon Favreau eat a dikk
Or it may not fit the narrative anymore homie. Relax your ass I'm going to miss the song but you know what the dope thing is? I can always pull Lion King off my shelf and watch that version anytime I want