For anyone running into this problem here is a work around. It is set up like a drawer but not in a drawer:
1. Create a table connected to your parent model
2. Create a table connected to your child model
2a. Set a condition to connect to the parent: Default filterable off
3. Have a “Row Action” show a table connected to your children
(These are the same actions you would set for a drawer)
3a. Activate and Set Value
3b. Query Model (child object)
3c. Save Model (child object)
4. Conditionally set the the child table to only show when the child model has data rows
5. Set your mass action button on the child table
5a. I added another action at the end to empty the child model to ensure it disappears.
Let me know if you have questions!
