The hitbox of trapdoors is not as wide as a block, it is possible to jump on the small ledge created by placing a trapdoor over a block.
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Does this bug still appear in 0.14.3? Please respond.

Confirmed for 0.15 realms alpha build 4

@@unknown: Realms Alpha build 4 is no longer supported on this tracker.
Confirmed to affect 0.14.3 on iPhone 6+ (iOS 9.3.2).

Confirmed for 0.15 b1

Please respond and add the current version if you can reproduce this issue.

Will do as soon as I am able to download the update.

Reproduced on 0.16.2, LG G5 H850 with Android 7.0

This is because the bounding box of trapdoor is inset 0.0005 (half a millimetre) of a block in the horizontal axes.

Confirmed to affect 1.1.0.0. Affects both wooden & iron trapdoors.

This is still occurring in the latest builds. 1.2.13.8

Affects 1.2.15

Affects 1.2.16

Affects 1.4

Affects 1.6.0

Still affects 1.12

Please fix this soon

It is the same with mobspawners

Affects 1.13

Still affects 1.13.1

as a feedback comment, from my opinion this is a useful feature in some cases and as it has been here for a lot of time is considered a feature by me

It does not only work vertically. It also works horizontally. You can place a trapdoor or mob spawner between normal full blocks like for example stone and you'll see that you are lower than standing on top of a normal block like stone. And if a trapdoor or mob spawner is in a ceiling and you fly in creative mode against the ceiling you can fly against a block like stone next to the spawner or trapdoor.

Possibly related to MCPE-59428

Affects 1.14.2

Here is the bug report for mob spawners. MCPE-66828

I'm still experiencing this problem, i have villagers in a 1x1x2 space. They are standing on halfslabs, the halfslab is surrounded by glass blocks, on top of the first row of glass i have a nother row,, except in one side were i have a trapdoor, the villagers can walk from the halfslab onto the glass block that has the trapdoor on top.
They shouldn't be able to do this, then they can jump from the glass block to the trapdoor on top and escape the holding area.
Resolving issues that were marked as fixed in the 1.15 and 1.16 Betas, now that 1.16.0 is being released.