Currently, the contributions stream is segmented based on timestamp, which is not a unique key. This can lead to contributions being skipped if the segment boundary falls between two contributions with the same timestamp (T200259).
|Open||None||T229661 Core REST API in MediaWiki|
|Open||None||T247876 User contributions API|
|Open||None||T258623 Use unique criterion for segmenting contributions|
|Open||thiemowmde||T200259 ContribsPager should use a unique criterion for paging|