Mob heads and skulls, signs, (Ender) chests and End Portals disappear when moving more than 63 blocks away.
Steps to reproduce:
Place mob heads or chests
Walk or fly 63 blocks away
Maybe related to MC-1616
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Does the same effect apply to signs and item frames? Entities like these disappear before blocks do as they are considered 'dynamic' and therefore take more processing space. It is as if rendering is done in gradient to avoid lag.

confirmed with chests as well. Since both are entities.

Ender chests too.
New screenshots attached.

Does not apply to all blocks with an tile entity, so furnaces, dispensers, nether portals and so on remain visible, but the book on the enchantment table is also invisible at > 63 blocks.

No, when I mention an 'entity' I refer usually to a tile entity that does not occupy the block mechanic. That is, although a furnace is a tile entity, signs etc. disappear first because they are not 'blocks'. However I have also observed that tile entities such a heads, signs, item frames, chests and not tile entities such as end portals and vines (although vines have no metadata except for orientation) render first before other blocks.
It works like this for performance reasons