Why do members of a House and Senate conference committee sometimes add provision to a bill as the work on it?

To protect the interest of all parties involved in the bill.

Explanation:

During the creation of the bill, the government had to pass through several processes. Including setting up the budget needed to enact the bill along with other additional things that needed to ensure that the operation run smoothly.

There will be some circumstances when some sort of weakness or issues found in the bill after it passed its initial draft review. Provision is made to fix the issues and ensure that the bill can be eristically actualized.

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