Evergreen not returning all tests for a task

When following the "next" links returned as part of Evergreens rest api, it is not possible to get all of the tests run for certain tasks. An example is 

https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_windows_all_feature_flags_required_display_noPassthrough_patch_ec97c7f137a73faa8579c5616e364b86e6cf56c8_61fb98543066151ce7df054a_22_02_03_08_54_46

In the UI, it shows that over 700 tests were run in this task. However, if you use the rest api and follow the paginated links provided in the response headers, it is only possible to get up to around 400.

This affects our team greatly. We rely upon this api working for both BFG log processing to work correctly and for the Auto Reverter to be able to tell what tasks are able ok to revert.