The old bug is https://github.com/cryptonomex/graphene/issues/615 .
Due to the bug, `update_median_feeds()` and `check_call_orders()`
will be called when a feed is not actually expired, normally this
should not affect consensus since calling them should not change
any data in the state.
However, the logging indicates that `check_call_orders()` did
change some data under certain circumstances, specifically, when
multiple limit order matching issue (#453) occurred at same block.
* https://github.com/bitshares/bitshares-core/issues/453
8a9d3e7775