I was playing in Creative mode and an Advancement popped up.
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Thank you for your report!
However, this issue is Working as Intended.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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Intentional design, per triaging of MC-226427 and similar reports.
Advancements being unobtainable in creative are considered bugs.