When i summon enderman and carried with end portal block. It's not rendered block. And I found list of enderman holding block render glitch.

List of Block Not Rendered :
/summon Enderman ~ ~ ~

{carried:end_portal}

/summon Enderman ~ ~ ~

{carried:skull}

/summon Enderman ~ ~ ~

{carried:standing_sign}

/summon Enderman ~ ~ ~

{carried:wall_sign}

/summon Zombie ~- ~ ~ {Equipment:[

{id:end_portal}

,{},{},{},{}]}

List of Block Rendered Glitch :
/summon Enderman ~ ~ ~

{carried:unpowered_repeater}

/summon Enderman ~ ~ ~

{carried:ladder}

/summon Enderman ~ ~ ~

{carried:flower_pot}

/summon Enderman ~ ~ ~

{carried:double_plant}

/summon Enderman ~ ~ ~

{carried:tripwire}

/summon Enderman ~ ~ ~

{carried:pumpkin_stem,carriedData:7}

/summon Enderman ~ ~ ~

{carried:melon_stem,carriedData:7}

/summon Enderman ~ ~ ~

{carried:fire}

/summon Enderman ~ ~ ~

{carried:tripwire_hook}

/summon Enderman ~ ~ ~

{carried:redstone_wire}