As of 21w10a, all named ores in the game have a dedicated block tag named after the ore block in question, with the specific exception of nether quartz ore, which would be expected to have a block tag (#minecraft:quartz_ores) but does not have such a block tag.
Said tag may, however, be redundant given that nether quartz ore is the only type of quartz ore in the game (although a fix to MC-216217 may change this).
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Probably intentional; there's no reason for a block tag to exist, and the linked bug was a feature request, not a bug.
Can confirm. Could be intentional.