Tellraw command will not print non-player objectives

I don't know whether this is an intended feature, however the tellraw command has some bizarre behaviours when handling entity scoreboard objectives. When it is used to print a player's objective of a given score to the chat, it behaves normally, however when printing the score of a non-player entity the command SUCCEEDS however refuses to print the score, instead just leaving empty space. This makes one of tellraw's most practical features near useless for complex command block contraptions.