The MC and EDP simulators were only reading the first page of results from ListEventGroups. This means that in environments with more EventGroups, not all test EventGroups would be read. This is exacerbated by #1916, as the default page size is now smaller.
The MC and EDP simulators were only reading the first page of results from ListEventGroups. This means that in environments with more EventGroups, not all test EventGroups would be read. This is exacerbated by #1916, as the default page size is now smaller.