Change record status: 
Project: 
Introduced in branch: 
11.5.x
Introduced in version: 
11.5.0
Description: 

Elements implementing FormElementInterface can now declare a #value_callback in getInfo() and have it kept. ElementInfoManager used to overwrite it with the default [<class>, 'valueCallback']. Now it only applies that default if the element hasn't declared its own.

No action needed unless your element declares a custom #value_callback. It's respected now instead of discarded.

Impacts: 
Module developers