When eating anything, the player can phase through blocks. This doesn't happen everytime and doesn't seem to have consistent reproduction methods, but it seems to require eating and moving at the same time. This occurs with any block, be they solid or non-full like stairs and slabs, and can cause unexpected deaths.
Observed results:
Eating while moving can cause players to phase through blocks.
Expected results:
The player should not be able to phase through blocks while eating.
Here are some example videos: https://www.reddit.com/r/Minecraft/comments/16sxyzc/well_thats_enough_minecraft_for_today/
https://www.reddit.com/r/Minecraft/comments/16wrim2/recently_acquired_elytra_saved_me_from_glitchy/