The awaited leeching debacle!

I believe gMS was the only version with the "malfunctional" version. How did you know that it's supposed to work against Bishops?

You answered your own question. If a newly released feature behaves differently than it does in every other version and was never specifically explained how it was supposed to work the default answer is that it's malfunctioning until it's explicitly explained. "Working as intended", the only reply we ever received, failed to explain what intent was and was therefore not an acceptable answer because the players had no way to judge the truth of that.

The experience system is working exactly as it's intended and more importantly, as it's been defined to be. You can readily test the stated behavior of it against the reality and confirm they match, where elementals you could only compare the stated behavior from other versions to the reality here and determine a gap in both documentation and functionality. Leeching has been clearly described, defined, validated to work as expected and declared legal until something changes.

This is the final statement on this subject, because it's off topic here because the two situations are not relative.