Prevent tickEntries being lost in some cases where the tickEntryIDs could be equal, prevent BlockTracker possibly returning the same ID twice.
Prevent tickEntries being lost in some cases where the tickEntryIDs could be equal, prevent BlockTracker possibly returning the same ID twice.

Signed-off-by: Ross Allan <ca2c77e14df1e7ee673215c1ef658354e220f471@gmail.com>

nallar/TickThreading