In 1.14.15 KSPI-E, USI's MKS modules for their version of regolith processing (based on the Dirt resource instead of Regolith) worked fine, somewhat like the new Universal Drill except that the relevant modules consumed/"processed" pre-mined Dirt to output the various resources a world offers.

As of 1.15.1, those modules from USI-MKS (the 'Ranger' Regolith Sifter and the 'Tundra' Industrial Regolith Sifter) no longer process dirt or output resources, not even the flat-rate "Rock" resource byproduct. (I noticed existing compatibility support for it, so I figured this was unintentional but something y'all might like to address.)

I double-checked everything; KSPI-E and the Interstellar Fuel Switch are the only updates that occurred during the relevant span of time over which I noticed the change in behavior. It's nice to see that KSPI-E has adopted a module with similar functionality, though I would like to have both sets working... especially since it just neutered a base I just started setting up in career mode.

I wish I could be of further help, but the best technical information I can give is that I wasn't able to identify any part of the Patches .cfg files responsible for the change by examining the differences among them and performing manual edit tests. It's probably something in the .dll codebases.

I've noticed some weird errors arising from problems with CKAN and mass-modding. I'm checking now to see if the problem might be due to CKAN instead.

I don't know exactly what the combination of orders was, but it was indeed a CKAN issue - not all files were deployed from 1.15.1 properly. My apologies.