Of course it happens as I have shown with the screenshot. It's happening right now and nobody cares. You can also look it up on bfxdata. Seemingly because suddenly people (god knows why, it never happened before 1.5 months ago) order large amounts of money (6 figures+ multiple times) and don't include "variable" rate" to be taken which cleans the order book behind the FRR but leaves it intact. Tunneling like that should not be possible, it messes up the order book, ruins any predictability and further kills liquidity.
I checked bfxdata but they only have a volume weighted graph. But even this shows rates of 0.22. Impossible with FFR before it. So either FRR wall vanished because of some bug for some time or the FRR rate was calculated wrong for a moment. Maybe FRR showed up on the wrong side of orderbook only.

I dont understand what you mean with tunneling. Either FRR is eaten up by 6 figues + or not. But i dont see how it could get tunneled normally.