Noto color emoji font not rendering

I'm using debian buster and melt 191020. I've installed the fonts-noto-color-emoji package.

$ fc-match emoji
NotoColorEmoji.ttf: "Noto Color Emoji" "Regular"

But when redering the following xml, the emojis do not show up in the final video:

<property name="mlt_service">dynamictext</property>
<property name="argument">M 🎅ANY THANKS!</property>
<property name="geometry">
2.8823532941176464%/19.166667333333333%:103.83137198055492%x54.61666666666666%:100
</property>
<property name="size">500</property>
<property name="halign">center</property>
<property name="valign">middle</property>
<property name="family">AmaticSC</property>
<property name="weight">700</property>
<property name="style">normal</property>
<property name="pad">20</property>
<property name="bgcolour">#00000000</property>
<property name="fgcolour">#ff222222</property>

Any ideas on how to troubleshoot this?

Start by reproducing the XML dynamictext rendering with melt 191020 on Debian buster, and compare the fc-match result with the final video output. Trace the dynamictext font-selection and emoji-rendering entry points. Done means the Noto Color Emoji glyph appears in the rendered video, or the limitation is documented with a clear workaround.