When within the world border, and approaching it, it gradually fades into view. This is not the case when outside the world border and approaching it - it always appears at full intensity.
This can be tested by moving the center of the world border a few hundred blocks.
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Can confirm in 21w39a. Relates to MC-234358.
I believe the glitchy patterns are gone in this snapshot but it still doesn’t fade even though it should.
Can confirm in 21w19a and 1.16.5.