Some SVG texts dissapear when using specific font on FOP

Given:

• The sample input.xml
• Having image.svg in your system (please adjust paths in the .xml to your local machine, see file:/// url in the external-graphic element).
• The gotham-fonts.zip either installed in the system or configured trough .xconf

When producing the PDF, there should be a text "LCS" and another "lcs", but currently only the lowercase is visible from FOP. Opening the .svg from a viewer (e.g. Chrome) doesn't present this issue.

On my team we were not able to locate the issue, and altough it's related to the font, it's really weird that it works with texts and fails with some others (there are other uppercase examples that work, it's just "LCS" the one that doesn't).