If you edit a Schwab account that uses SWGXX as cash, the Online Services' tab Set/edit, only lists using None. Therefore, every download for Bought and Sold has to be deleted or the Cash Balance will be incorrect. (Another problem is that downloaded Dividend transactions are always zero.)
This has been a problem for years. The most recent discussion, Can't treat SWGXX as cash in Schwab brokerage account - Quicken, has a comment by Quicken Alyssa, dated 7/16/26 that says, " It looks like this will reach a resolution point soon, though I cannot say for certain, or provide an ETA." The discussion is now closed in spite of my request to keep it open until resolved.