New-UDDataGrid Pagination RowsPerPageOptions not displaying

I have a New-UDDataGrid being fed an array of data, typically 5000+ items. I have it initialized as below, but the RowsPerPage options never show. Only the default page toggles which move 15 at a time.

New-UDDataGrid -Pagination $true -PageSize 15 -RowsPerPageOptions @(10, 20, 50, 250) -Density "compact" -StripedRows $true -LoadRows {  
   $gridData | Out-UDDataGridData -Context $eventData -TotalRows $gridData.length
} -Columns @( <various column definitions> )

This is on PSU 4.5.4. Thanks!