The player keeps its 1 block height of swimming animation when going out of water

You can keep your 1 block height of swimming animation out of water.

How to reproduce:

• Place some non-full blocks (like glass, slabs, stairs, etc...) under water followed by an hole with a sign behind.
  
• Do a platform out of the water, behind the hole.
  
• Go underwater, swim to the non-full blocks to have your head right under them.
  
  
• Walk to the hole and stand on the block under the sign.
  
• Move forward, you will keep the 1 block height.