When placing a blueprint from a book, still getting this error :

The mod Companion Drones 2.0 (2.0.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event companion-drones::on_pre_build (ID 9)
Record is not a BlueprintRecord.
stack traceback:
[C]: in function 'get_blueprint_entities'
companion-drones/script/companion.lua:1519: in function 'get_blueprint_area'
companion-drones/script/companion.lua:1557: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>

Yes I know about this, but looks like what worked in 1.1 is broken
I must find a workaround or better proper solution

I found a workaround. I'll tell you on discord

Thanks for a tip, i have made it little different - when blueprint book is used, calculate the area from largest blueprint in current blueprint book