Reaching conclusions without adequate data is perilous. Nonetheless, here goes.
Either Eastman Kodak's stock of backing paper ran out and it could no longer source more from the same supplier, or, responding to the rampant bitching and moaning about how expensive its film is, it put the backing paper contract out for bid, then selected the low bidder, which allegedly met Eastman Kodak's specification. The specification might not have included sufficient bleed through immunity requirements.
Either way, it's pretty obvious that the sequence was 1) Eastman Kodak changed paper 2) problems ensued. This is the same experience HARMAN had with its 120 backing paper not too long ago. Whether shipment, storage and use environmental conditions exacerbated the backing paper's tendencies is irrelevant. The same conditions existed for product shipped previously that used the old paper and we didn't hear of the problem before.
I believe that Kodak Alaris' email replies, as they were reported here, are weasel worded and provide an inadequate response to the situation. However, it was Eastman Kodak that made the film. Kodak Alaris might not have sufficient influence (or disclosure authority) over Eastman Kodak to respond in any way other than offering replacement film. Such is the lawyer-driven world we live in today. I predict that, at some point after the supply chain (and Eastman Kodak's current stock) is exhausted, we'll see an announcement about Kodak 120 films being manufactured with a "new, improved" backing paper. One that actually works under all reasonably expected conditions. Until then, either play craps with Kodak 120 or don't. The choice is yours, not that there are too many high-quality options left. But simply continuing to complain about the situation does nobody any good; it just makes for longer threads and distracts from more useful discussions.