&outputSeparator + ajax technology don't work correctly

[martia-by]

&outputSeparator + ajax technology don't work correctly
pdoPage + pdoResources +ajax

pdoPage
When outputting results through pdoPage, everything works great. However, when trying to load additional search results through ajax (example below), the &outputSeparator is not displayed between the ajax loaded blocks.

        [[!pdoPage?
            &parents=`28`
            &ajaxMode=`button`
            &ajaxTplMore = `@INLINE <button class="btn-more button-fm">Other questions</button>`
            &depth=`0`
            &tpl=`faq_tpl`
            &limit=`3`
            &outputSeparator = `<hr>`
        ]]

::Before ajax (all right) :

result 1 
<hr>
result 2 
<hr>
result 3 

button (btn-more)

::After ajax :

result 1 
<hr>
result 2 
<hr>
result 3 
result 4
<hr>
result 5
<hr>
result 6
result 7
<hr>
result 8
...

button (btn-more)

There is no separator between the 3rd and 4th elements (between ajax results).