bug: infinite loop when 2 factories refer to each other in their `default()` methods

Since 2.x on one of my projects, I have a segfault when I try to create a complex `PersistentProxyObject` with a lot of dependencies. 
On 1.x no issues at all.

I dig a lot to find what's wrong but I have no clue. 
Reproducer is here : https://github.com/simondaigre/foundry-repro/tree/repro-segfault