NotoSansKhmer-Regular.ttf
I noted the following in the logs. Looking at the trunk you had Type 4 already but not 3 and 6.
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 3 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 4 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 4 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 4 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 4 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 4 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 6 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 7 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 7 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 7 GSUB lookup table is not supported and will be ignored
19:05:37.334
[main]
DEBUG org.apache.fontbox.ttf.GlyphSubstitutionTable - Type 4 GSUB lookup table is not supported and will be ignored