tangle header argument not picked up in #+PROPERTY line or :PROPERTIES: block

[Joost Kremers]

Hi list,

I'm having trouble tangling an Org file. Basically, if I put a 
=:tangle= header argument in a =#+PROPERTY= line at the top of the 
file or in a =:PROPERTIES:= block under a header, it is not picked 
up and the code blocks to which (I think) it should apply are not 
tangled. Only when I put a =:tangle= argument at the top of the 
source block itself is the source block tangled.

Is this expected behaviour? Am I doing something wrong?

Emacs 26.3, Org 9.3.6.

TIA

Joost


--
Joost Kremers
Life has its moments