E.g. from ourbigbook.com/cirosantilli/ciro-santilli:renders as:instead of the desired:
<Python>
/cirosantilli/python-programming-language#cirosantilli/python-programming-language
/cirosantilli/python-programming-language
However the link to the non-synonym header:renders correctly without the fragment
<Python (programming language)>
OK, this was also reproducible on CLI, links to toplevel synonyms had fragments, just it is infinitely more visible on web where everything is toplevel.