Keep on forgetting to manually install model-ensembler, which isn't an explicit dependency of icenet so needs to be included in the conda environment install. Why not do this to pin icenet too, provided it doesn't interfere with the solver (which is painful enough at the best of times).
Does this link to any changes you've been making recently @bnubald? Going to see if it works well as I'm recreating environments often at the moment across HPCs 😉