Go to Project Settings → Automation → click Create rule
Create a trigger
2.1. Choose Field value changed
2.2. Choose Checklists → Save
2.3. Save trigger
3.1. Add component New Action
3.2. Choose Set entity property
3.3. Fill in the fields with the following values:
Name your new Automation and Turn it on
Proceed with the bulk update
Once the bulk update is completed, turn the rule off.
☝🏼 NOTE: Make sure this rule is only enabled when you need it for the bulk update operation. Otherwise, it will constantly run the synchronization, and you don't need that as a normal checklist operation would suffer.