This is a two-part report.

1. Occasionally (only once that I saw, but once is enough to merit investigation in my opinion), the Ring of Far Reach extends client-side interaction far...far beyond what it ought to be. As in from a tower 40 blocks off of the ground, I can break grass, punch trees, whatever else you can imagine. However, the interactions aren't actually valid, and result in "invisible blocks" that haven't actually been broken.

2. Consistently (every time I've used the ring), the Ring of Far Reach appears to extend one block outside of its actual range, resulting in the same invisible blocks when those blocks are broken.

This is on the 1.0.3 version of the DireWolf20 pack, FastCraft installed, nothing else.

The ring seems to extend the reach by 3 blocks every time I jump between dimensions.

same, DW20 1.0.3 (Botania 146)

Also, after some time and relogs the ring's reach stops applying to block-placement distance, only to block-breaking distance. I can mine a block in extended reach, but I can't place anything there, server rejects the interaction and the block to place just flashes in there.

Does this happen in LAN, SMP or SSP?

It was happening for me on SMP. I don't know about other types

I'm not going to fuss much about it if it doesn't happen on SSP, since I know baubles is super fiddly in the others :|

I'm only playing SSP and i get this every time I jump between dimensions so :P

Interesting, I'll have a look at it sometime then.