Why do manual intensities snap to background when I run an unrelated Phantom Cuelist?

I have some lights manually set at 60% and am running multiple cuelists. The lights are not recorded in any of said cuelists. If I trigger a cuelist containg some unrelated non-dims, and nothing else, my manually set lights snap to their background intensity values. This is a very irritating and irrational behaviour. Is this a bug or feature, and why would something like this be needed?

Thanks!

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