When trying to place a block above the maximum world height of y=256 an error message is displayed above the hotbar explaining that the block cannot be placed. However, no such message exists for trying to place blocks beyond another such extreme, the world border.
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In 1.16, 1.16.1 and 20w27a
Can confirm in 20w51a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w06a.
Can confirm in 1.16.5 and 21w08b.

Can confirm in 1.17 Release Candidate 2.

Can confirm in 1.17.1.

Can confirm in 21w44a.
Can confirm in 1.19.

Can confirm in 1.20 Release Candidate 1.