I "fixed" the problem by not discarding the previous tree. Instead of building a new one, just "clean" the one you have, i.e. , get rid of all children - don't forget to set the expanded nodes as not expanded too.
It seems that if you create a new tree, myfaces will
try to use the previous tree state. If you use the
same one, no problem arises.
Is this really supposed to work like this ?
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