Tested in creative, having a powered dispenser with a fast-clock update, shoot arrows into stairs/slabs will sent the arrows to the player's inventory up to 10 Blocks away.
Also, while this is running, the button does not get pushed out until the arrows are finished or the clock is interrupted.
What I expected to happen was:
Arrows to get stuck in stairs/slabs
What actually happened was:
Instead, Arrows was sent to my inventory when within 10 blocks of dispenser.
Button return can not update until redstone is broke or arrows finish.
Steps to Reproduce:
1. Place a dispenser
2. Place stair/slab in front of the dispenser
3. Add arrows in the dispenser
4. Connect Redstone to trigger dispenser
5. Move away, and notice arrows flying at you!
Related issues
duplicates
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Someone posted it to r/Minecraft awhile ago.

Duplicate of: [MC-3330] - Please use the search function to see if your bug has already been submitted.
Currently 30% of tickets are being closed as duplicate.

My Bad, I did search, not sure why it didn't show up.

Also, while this is running, the button does not get pushed out until the arrows are finished or the clock is interrupted.
This isn't mentioned on the other post??
Edit: Sorry, this seems to apply to 1.4.5a. I've updated with the launcher and this no longer occurs.
Carry on with the good work 🙂