Hi,

after inspection upstream, it seems the bug is caused by the ubuntu/debian 
specific initramfs-tools hook in debian/local/plymouth.hook. The analysis is in 
comments
https://gitlab.freedesktop.org/plymouth/plymouth/issues/92#note_418076 and
https://gitlab.freedesktop.org/plymouth/plymouth/issues/92#note_418219 of the 
upstream issue (which is now closed). 

To summarize, the ubuntu initramfs-hook does the following while copying
a theme to the initramfs:

# copy plugin and images for current theme
        copy_exec "${MODULE}"
        cp -a "${THEMES}/${currtheme}" "${DESTDIR}/${THEMES}"

which misses directories that are not descendants of the ${currtheme}
one. Plymouth upstream provides a script which does the right thing,
maybe it's worth using.

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https://bugs.launchpad.net/bugs/1856712

Title:
  spinner theme displays a blank (black) screen at boot on some systems

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