Placing a beacon with water more than 10 blocks above it causes a server crash whenever that chunk is loaded until the block is removed. Posting here as well since there has been no response on the issue, and its included in Chisel n Bits.
Communi-Suggestu/Saecularia-Caudices#1

Yep this is indeed fixed

This looks like it's fixed in 1.0.13

Im having this issue too. I found that its not just water, but when you place a beacon with any block above it then it crashes.