why do i have to set fixedRotation before setCircle to get working materials?

[valueerror]

  

i have a very simple testexample and just stumbled upon this strange rule again so i decided to ask here WTH ?

 

if i do this:

player.body.fixedRotation=true;player.body.setCircle(22); 

everything is fine..  i can set materials afterwards and the will work as expected..

 

but if i set the circle first my materials are simply ignored.. ?

 

thx to anyone who has an explanation for me..  i just want to know why so it makes sense to me and i can replace a "silly rule" with logic