I have investigated a bit more and looks lite it is Options._relation_tree 
property, it's value is calculated by _populate_directed_relation_graph 
only once and it is @cached_property, so I see no valid way to reset value

On Tuesday, September 5, 2017 at 4:40:02 PM UTC+4, Michal Petrucha wrote:
>
>
> If this doesn't help, then you might have to investigate if there's 
> perhaps some cached attribute that doesn't get cleared. 
>
> Good luck, 
>
> Michal 
>

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