Piston pushing block inside of you gets you out of f5 mode?

(I DON'T KNOW IF THIS IS ACTUALLY A BUG because i tried it in the latest snapshot and in version 1.3.2 but I just found it strange)

I wanted to see how it would look if a player suffocated in a slime block in f5 mode and I expected it to stay in f5 mode.

When I stepped on the pressure plate, the piston pushed the block inside of me and when I got out I was in the first person view.

It does not matter in which third person view you do it, and it also doesn't matter if you are in creative or survival mode)

Steps to Reproduce:
1 First you reproduce what I included on the screenshot.(if you use slime blocks, it would be handy to use a furnace instead of a normal block) (you don't have to use slime blocks, blocks like glowstone work too)
2 Then you press f5 one or two times.
3 Then you stand on the pressure plate.
4 Then you walk out of the block.
5 And you are in first person again.

I hope that you can do something with it and sorry if this is not a bug and i've just been wasting your time.