Using the PickBlock feature on Windows 10 edition (Middle Click by default) you can obtain End portal blocks, which show the 'update' texture.
Steps to Reproduce
Create a normal End portal
Use PickBlock (middle click) on the portal blocks
End portal blocks with wrong texture is now in your inventory and hand and can be placed
Can confirm on a Shield K1 with a bluetooth KB. Pick block was reassigned to the "U" key