Empty text in the font Source Code Pro

I use the font 'Source Code Pro' from here: https://github.com/adobe-fonts/source-code-pro/blob/482adcaccf9777f2850974e08c60e706b1ad9169/TTF/SourceCodePro-Regular.ttf

FOP config fragment:

<font embed-url="file:/C:/fonts/SourceCodePro-Regular.ttf" kerning="yes">
	<font-triplet name="Source Code Pro" style="normal" weight="normal"/>
</font>

This block:

<fo:block>text <fo:inline font-family="Source Code Pro">Source Code Pro</fo:inline> text</fo:block>

renders ok in FOP 2.5 (see attached test_SourceCodePro_fop_2.5.pdf),
but renders empty space in FOP 2.6 and 2.7 for the font 'Source Code Pro' (see attached test_SourceCodePro_fop_2.6.pdf).