Part of the problem is that pages are served as ISO-8859-1 which only contains the 1st 256 code points of unicode when emoji are higher up. The euro sign should also be a problem but an updated version swaps a few symbols out.
Test: Euro, generic currency sign, kettle + 3 carriages
, ¤,
Test: Euro, generic currency sign, kettle + 3 carriages
, ¤,