Chemfig: submolecules not printing properly after upgrading from TeXLive 2015 to 2020

Question

Here is a MWE of the code I'm talking about:

\documentclass[12pt]{article}
\usepackage{chemfig}
\definesubmol{MP}[-[4]P(-[3]O^\ominus)(-[5]O^\ominus)=[4]O]{-P(-[1]O^\ominus)(-[7]O^\ominus)=O}
\definesubmol{MA1}[(-[7])-[4](-[5]O^\ominus)=[3]O]{(-[3])-(-[1]O^\ominus)=[7]O}
\definesubmol{MA2}[(-[1])-[4](-[5]O^\ominus)=[3]O]{(-[5])-(-[1]O^\ominus)=[7]O}
\begin{document}
\chemfig{--[:300]N(-[1]!{MP})-[:330]-[6]-[:210]N(-[7]!{MP})-[:240]-[4]-[:120]N(-[5]!{MP})-[:150]-[2]-[:30]N(-[3]!{MP})-[:60]}
\end{document}

After upgrading to TeXLive 2020 (through MacTeX), the submolecules print out the actual string instead of rendering them as structures (see image).

Before when I had TeXLive 2015, it was printing properly. Does anyone know how to fix this? Thank you!

EDIT: A related question with a shorter MWE may be found HERE.

I am running TeX Live 2020, chemfig v1.56, and your MWE seems to compile correctly. — andselisk, Nov 02 '20 at 06:42
Also, note that many style guides and recommendations, most importantly, ACS Style Guide, suggest not to place circles around plus or minus signs. — andselisk, Nov 02 '20 at 06:46
I am also running the same which is very odd to me. Maybe I will just have to make it a separate figure and import the image — Muhammad Khan, Nov 02 '20 at 18:17
If you put \listfiles before your \documentclass, then the log will tell the versions of the files that it uses. Could you post that as well? — Teepeemm, Feb 17 '21 at 21:17

score 3 · Answer 1 · answered Jul 21 '21 at 20:31

3

I tried your example with TeX Live 2022/dev and got the following picture:

answered Jul 21 '21 at 20:31

citsahcots

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Chemfig: submolecules not printing properly after upgrading from TeXLive 2015 to 2020

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