documentTree Macro: Can't exclude pinned pages

Hi,

first bug report here. Regarding the documentTree macro.

Please let me know what I can do make helpful bug reports.

Page Structure:

Page1
Page2
Page3
Page3.Subpage1 
Page3.Subpage2 ← pinned
Page3.Subpage3
Page3.Subpage4 ← pinned
Page3.Subpage5

Macro invocation code:

{{documentTree root="document:Page3.WebHome" exclusions="document:Page3.Subpage2.WebHome,document:Page3.Subpage4.WebHome"/}}

Expected Result:

A document tree containing:

Page3.Subpage1 
Page3.Subpage3
Page3.Subpage5

Actual Result:

A document tree containing:

Page3.Subpage2
Page3.Subpage4{}{}
Page3.Subpage1 
Page3.Subpage3
Page3.Subpage5

Background:

This could just be a documentation problem. Judging from XWiki 16.4.0RC1 release notes I would not have expected pinned pages to be non-exludable.