XWikiDocument.getChildren(XWikiContext context) skips pages with parent like "wiki:docName"

to reproduce:
create a document called "testParent"
create a document called "testChild"
create a document called "testChild2"
set parent of testChild to "testParent"
set parent of testChild2 to "xwiki:testParent"

write script in testParent to call getChildren and print all results.

observe results include testChild but not testChild2