The bug

Score text components do not work with entity UUIDs and do not print the same error messages if multiple entities match a selector.

How to reproduce

Different error message

See also MC-113962

1. Use the following command containing a score component

   /tellraw @p {"score":{"objective":"","name":"@e"}}
   

   → It prints "Selector '@e' found nothing"

2. Use a different command which allows only one entity

   /tp @p @e
   

   → It prints "Entity '@e' cannot be found"

Entity UUID not working

1. Use the following command to create an scoreboard objective

   /scoreboard objectives add test dummy
   

2. Summon an entity with a defined UUID

   /summon armor_stand ~ ~ ~ {UUID:[I;0,0,0,0]}
   

3. Set a score for the entity; you can use the UUID to identify the entity if you want to

   /scoreboard players set 0-0-0-0-0 test 1
   

4. Use a command with a score component

   /tellraw @p {"score":{"objective":"test","name":"0-0-0-0-0"}}
   

   → It does not print the score

Code analysis

Based on 1.11.2 decompiled using MCP 9.35 rc1

The method net.minecraft.util.text.TextComponentUtils.processComponent(ICommandSender, ITextComponent, Entity) does not use the method net.minecraft.command.CommandBase.getEntity(MinecraftServer, ICommandSender, String), instead it partwise implements the behavior of this method itself.