If you're curious why, it's because of the California itemized deduction phase-out, line 29 in the instructions below [1].
CalFile only cares about handling "simple" items. Other notable exclusions [2] are capital gains, health savings accounts, Schedule C, Schedule E, and Roth IRA conversions and distributions.
[1] https://www.ftb.ca.gov/forms/2022/2022-540-ca-instructions.h...
[2] https://www.ftb.ca.gov/file/ways-to-file/online/calfile/calf...