Tomorrow has not been assessed yet. Its meetings, obligations, and available attention may differ from today's. Automatically rescheduling every unfinished item would let yesterday plan the new day before you do.
Steady therefore turns moved work into an unscheduled candidate. It can be considered again during planning, alongside your goals and other possibilities.
You may choose it tomorrow. You may make it smaller, wait for missing information, or decide it no longer belongs.
This extra decision is intentional. A commitment should enter a day because you chose it for that day, not because it survived the previous one.