The Azalea block/entity model has a graphical bug in which the placed azaleas have black textures that change rapidly over them. It's completely random, but affects all Azalea blocks, old and newly placed, all in the FOV
Restarting computer, reinstalling Minecraft and changing graphical settings did not alleviate the bug
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Duplicate of MC-219985 which is marked as Awaiting Response. If you have any information such as a screenshot with your debug screen enabled (F3) please provided it to the parent report.