I was trying to fight the Gaia Guardian 2, but it started breaking a lot of blocks on the client only. This led to getting stuck in blocks that I fell into that were actually there, and ghost items following me around (Ring of Magnetization). This didn't happen the last time I tried it, before the recent updates. I haven't tried it on the first Guardian since then yet.

FML Log: https://dl.dropboxusercontent.com/u/79626245/guardianbuglog.txt

Looks like there is a missing check for worldObj.isRemote around https://github.com/Vazkii/Botania/blob/master/src/main/java/vazkii/botania/common/entity/EntityDoppleganger.java#L397 when it executes the code for destroying the block, meaning it it executed both server and client-side instead of only on the server-side.

Can Confirm Its happening To Me With the GG 1 I Tried To report An Issue 2 days Ago But i Messed Up :P