It appears Rina has ruled out a "visible characters" anomaly for the dropping instruments.

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It wouldn't be so much of an issue (albeit, still wierd) if this was only a display/max-charachters anomaly but, unfortunately, what also happens is that the instruments which are not exempted from the rest in the manner that BiaB was willing to accept the chord entry (the Piano in the above example) drop out and do not play for the beat(s) in question.

<3




I'm afraid I can only suggest some trouble shooting ideas since I can't offer a immediate solution. If you move the entire arrangement to RB you can than actually see what you say you are hearing. This is one reason I use RB for more complex "worked-out" arrangements where I want instruments coming and going for selected bars (I know if is supposed to be doable in BIAB, but I also have seen these issues where the instruments don't always completely behave).
Good Luck.