This seems likely to be related to the two previous bugs in this area.
I have a gold volcano erupting and seemingly randomly creating either supercooled ice, or liquid oxygen. I'd like to attach a save file, but the save is 10MB in size, and the forum software is limiting me to 4.88, so I've instead uploaded it to https://paste.c-net.org/FloristCriteria.
One potentially related thing I noticed: The neutronium base of the volcano isn't listed as being at absolute zero if you click on it and check the properties tab. Instead it appears to have the temperature of the environment. It even changes when the volcano erupts.
Wait for the gold volcano to erupt, then use the temperature overlay to see that small amounts of liquid oxygen or ice show up here and there. The behavior seems somewhat random, so please try a few times if it doesn't happen right away.