According to Fidelity, not so much:
How might a government shutdown affect fixed income this time?
Unlike a government debt crisis where a default is possible, a brief shutdown of government agencies poses little risk to fixed income investments. The Treasury will conduct its regularly scheduled bond auctions and continue to pay interest on its debt regardless of whether other government agencies are open or closed. Government money market funds are also unaffected by the shutdown.
Some short-lived volatility in the Treasury market could be possible if some investors choose to express displeasure with US fiscal policy by selling Treasurys as they did in April in response to the announcement of new US tariffs.
A prolonged shutdown could also potentially affect prices of some bonds issued by corporations who rely on contracts with the federal government for a significant portion of their revenues.
Keep an eye on the government schedule: https://home.treasury.gov/system/files/221/Tentative-Auction-Schedule.pdf
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