Filtering on date on planning misfunction ?

I don't know if it's really an issue but here is my fact

I want to see my planning from date x to date y with action and milestones

So I made my planning view from date x to date y in planning view.
planning is adjusted to show that, but as my planning got plenty of fixed milestones after date y, so I also see the definition lines of milestones after that date y.

As I don't want to see those milestones lines after date y, I defined a filter with "real end date <= date y"

But as soon as I define that filter, ALL milestones are masked and disappeared from planning view, even those before date y and only action remained shown on planning.

Normal Behavior ?
Regards

Same result all milestones disappeared.

BTW as I want to see only real ended milestones during that period, that's why I chose 'real end date'.

But one or another, they just disappeared from project view

A quick view for some disappeared milestones Without/With filter ( 'planned end date < 31/12/2016' in my case for example)

so there is no way to see gant with milestones for a specific period only ?