I had the opposite problem for the 2022 tax year: I turned out that, with investment losses and no earned income, my adjusted income was below the poverty line, which ... means your ACA healthcare subsidy is cut off entirely!
https://www.irs.gov/affordable-care-act/individuals-and-fami...
The "logic" there (from reading discussions of the cutoff) is that, "well, if you're below the poverty line, you should be on Medicaid and not on the ACA exchanges at all, silly!" Okay, but if you have wildly varying income, and a high income from previous years, you don't know that you'll be "in poverty" this year, and won't qualify because of the past year.
I was tempted to update my taxes to claim phantom income from my imaginary cash-based business, which would then get me the subsidy, but that feels ick.
(Which, I know, being retired on crypto, I also feel ick about taking the subsidies to begin with, but that's a different issue.)