I've tried various combinations of updating card steps, but the assignees always seem to get reset to nil values.
examples
basecamp cards step update 9717217379 "Follow up." --card-table 6253830453 --assignees "38087314" --due "2026-04-01"
basecamp cards step update 9717217379 "Follow up." --card-table 6253830453 --assignees "Matt Brooke-Smith" --due "2026-04-01"
I believe the assignees format is correct in the first command. Therefore, is this an API issue?