Change record status: 
Project: 
Introduced in branch: 
10.1.x
Introduced in version: 
10.1.0
Description: 

In Drupal 7, each custom block had an info field, this was used to derive the block ID in hook_block_info

In Drupal 8+ we use the block's UUID rather than the info field.

As a result the unique-values constraint on the info field is no longer needed.

From Drupal 10.1, multiple block-content entities can have the same value in their info field.

Impacts: 
Site builders, administrators, editors
Module developers
Themers