-fsantize-coverage-allowlist not working

[enfreck]

I am trying to compile a binary utilizing the allowlist feature in llvm-14 as I only want one function to be instrumented. My text file for the allowlist contains fun:_Z42Vsodor_top___024root___nba_sequent__TOP__0P20Vsodor_top___024root. But, when I compile with the allowlist nothing is instrumented - even the one I specified (verified by using Ghidra). I used the same exact file for an ignorelist to test that I was creating the file correctly and the ignorelist worked - everything except that function was instrumented. Is there anything that has to be done differently besides switching ignorelist to allowlist? I could also be misunderstanding the use case of the allowlist.