See screenshot.
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Confirmed in 1.13-pre7.

You can also place torches, on the top of them.

Confirmed for 1.13-pre8.

Confirmed for 1.13-pre9.

Confirmed for 1.13-pre10.

Confirmed for 18w30a.

Can't place these on top of the hopper though! MC-122352

Confirmed for 18w30b.

Confirmed for 18w31a.

Confirmed for 18w32a.

Confirmed for 18w33a.

I can place buttons and levers on the bottom of a hopper but I cannot place them on the top of a hopper.

Confirmed for 1.13.1.

Confirmed for 1.13.2-pre1.

Confirmed for 1.13.2-pre2.

Looking a bit weird, this bug is actually used by builders, so Won't Fix would be the best solution.