Processing Ashes in a centrifuge produces (among other, useful outputs) Phosphorous Pentoxide, which 1.2.2 was supposed to completely remove. See attached screenshot.

Since the processing recipes for Phosphorous pentoxide were removed, the dupe with them is still not accessible. The only question in this case is if we want to remove the pentoxide from this centrifuging recipe to prevent the build up of a dead material. This is the only recipe we would have to change, as it is not available through any other processing methods.

That would be a sensible approach. I'm thinking also that it could work to re-enable decomposition of Phosphorous Pentoxide. Back in 1.2.1 the imbalance between the composition and decomposition recipes resulted in a duping exploit, so we disabled both.

Now that players can't make the stuff directly in a chemical reactor, I don't see much harm in letting players decompose it in an electrolyzer. Unless I'm mistaken, Ash would still be a more tedious and less rewarding route than getting Phosphor or Apatite ores.

This is an oversight on our part, I did forget that it was possible to get pentoxide in this manner.

We'll have to investigate the degree to which this is exploitable for easy phosphorous.