Finder in documentTree doesn't work when there is a space character in the root parameter page path

Steps to reproduce:

1. Create the following page structure: "my page/test/"
2. Add this content to the page "my page.WebHome":

   {{velocity}}
   {{documentTree root="document:$doc.documentReference" finder="true"/}}
   {{/velocity}}
   

3. Search for the test page inside the Document tree finder
4. Rename the page "my page.WebHome" to "my-page.WebHome"
5. Search again for the test page inside the Document tree finder

Expected results: I am able to find the children page in both cases.

Actual results: I can only find the test page at step 5 but not on step 3.

Working query (my-page):

http://localhost:8080/xwiki/bin/get/my-page/WebHome?outputSyntax=plain&sheet=XWiki.DocumentTree&root=document%3Axwiki%3Amy-page.WebHome&root=document%3Axwiki%3Amy-page.WebHome&data=suggestions&query=test

Query with 0 results (my page):

http://localhost:8080/xwiki/bin/get/my%20page/WebHome?outputSyntax=plain&sheet=XWiki.DocumentTree&root=document%3Axwiki%3Amy%20page.WebHome&root=document%3Axwiki%3Amy%20page.WebHome&data=suggestions&query=test