UserList cannot apply many filters

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Hi,
I cannot apply many filters on a UserList :

$userList->filterByTopicTreeA(123);
and then
$userList->filterByTopicTreeB(123);

Both filters work (A or B), but when I combine them I get en empty list, and I'm sure that some users do have both criterias...

Merci beaucoup ! Sylvain.

chawilaclef