Recomb chances changed without patchnotes

Before the 3.27.0.G patch, recombinating a crafted rank 1 strength suffix(15-20 strength) with any tier 1 phys mod prefix gave around a 50% chance for succes with predictable recombing.

After the patch the chance for succes is now 1-5% depending on the tier 1 mod used.

There's nothing in the patchnotes about recombination chances being changed, so is this a bug, a display error or an undocumented change?

It was extremely useful in ssf for isolating tier 1 mods from items gained from the genesis tree so hope it's just a bug/display error and not a recombination balance change this late in the league