Change record status: 
Project: 
Introduced in branch: 
8.x-2.x
Introduced in version: 
8.x-2.0.alpha11
Description: 

BC incompatible changes:
- Support for rendering extra field blocks in layout builder got
dropped.
- Passing render arrays to CustomElement::setSlot() is deprecated.
Avoid it or use CustomElement::setSlotFromRenderArray().

Impacts: 
Module developers