LibreOffice Writer Table of Contents (TOC) Omits Single-Digit Page Numbers

Environment: 
Windows 7, LibreOffice 4.1.0.4
Problem: 

Using the Table of Contents feature, single-digit page numbers would be blank (missing) in the TOC. This did not happen in all documents I worked with, but I could not find relevant differences between documents with and without this problem. The TOC structure I used was simplified (no hyperlink), using just Entry, Tab (fill character: .), and Page #.

Status: 
Fixed
The Fix: 

Inserting a space (literal character) in the TOC entry structure between the Tab and the Page # made the page number appear. This looks like a bug in LibreOffice Writer. If I can verify that it's still a problem in the latest build, I will submit a bug report accordingly.