Command block minecarts lose their name after re-log

The bug

Minecarts with command block don't output their default or customized name after re-log.

Reproduction steps

1. Rename a command block minecart item

   /give @s command_block_minecart{display:{Name:"\"test\""}}
   

2. Place it on a powered activator rail
3. Enter a command, e.g.

   /say message
   

   It prints "[test] message" in chat

4. Reopen the world
   It prints "[@] message" in chat

Code analysis

Code analysis by Marcono1234 can be found in this comment.