Am pretty sure the fifteen rounds of Speaker selection battle was (in part) to implement new house rules that included single topic bills.

Rules of the House

See section 2.

Requirement with Respect to Single Subject Bills. Subsection (c) provides that, effective February 1, 2023, a bill or joint resolution may not be introduced unless the sponsor submits a statement setting forth the single subject of the bill or joint resolution. This statement must be included with the statement required by clause 7(c) of rule XII (Constitutional Authority Statements). A statement for any bill or joint resolution introduced prior to the effective date shall, to the extent practicable, be submitted by the sponsor prior to committee or House consideration.

Am pretty sure the fifteen rounds of Speaker selection battle was (in part) to implement new house rules that included single topic bills.

Rules of the House