sequence_withheld

What it means

Events were kept but have no declared order. Timestamps are never promoted to process order.

What to do: Declare sequence.fields and sequence.basis.

Understand what is still available

This informational warning says that the events were retained, but the source did not declare their order. Paths and waiting times are withheld. Their absence does not mean that no events occurred or that waiting time was zero.

Declare only supported order

If your export contains a trustworthy work-object step number, the documented declaration is:

sequence:
  fields: [{column: step_no, type: integer, direction: ascending}]
  basis: case_step_number

Check a known claim before applying it across the source. If there is no defensible order, keep the warning and avoid path-based conclusions. Sorting timestamps does not supply the missing process-order evidence.