The intention for this feature was to ensure the theme always looks as
expected even if you were to open a new frame on a different display
device (e.g. open a GUI frame, start the server, then open a tty frame
from it).
It turned out to be buggier than anticipated. The underlying issue is
that solaire-mode is fundamentally incompatible with tty Emacs.
Terminals uses will need to disable it, as there's no good way to
predict what kind of frames a user will open.
TL;DR Avoid opening a TTY frame from a GUI session. If you must, and you
see odd colors, disable solaire-mode.