SegWit forked unexpectedly on testnet

[pawel7777]

As we all know SegWit, the simplest and safest solution for capacity increase, which is due to be implemented next month unexpectedly caused fork on testnet:

https://forum.bitcoin.com/bitcoin-discussion/segwit-forked-unexpectedly-on-testnet-t6111.html

[shorena]

Old node with outdated sigop counting code (consensus code change).

Longer explanation: they updated sigop counting in segwit v3 that was incompatible with segwit v2. some people didn't update their v2 nodes and forked.

-> https://www.reddit.com/r/Bitcoin/comments/48yz3d/segwit_forked_unexpectedly_on_testnet/d0nv34u