Nylium drops itself when it is broken, not netherrack. Nylium is simmilar to grass blocks and it must drop netherrack like grass blocks drop dirt. Nylium must be only obtainable by digging it with pickaxe enchanted with silk touch.
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If it's working as intended, then how come it was also marked "WAI" for the bedrock codebase to drop netherrack when mined w/o silk touch? Refer to MCPE-66941.
WAI as per @unknown's comment in MC-170900.