The cyclic diene shown is subjected to ozonolysis with reductive work-up. Which statements are correct?

The compound shown is 1-methylcyclohexa-1,4-diene. Cleaving both double bonds gives 3-oxobutanal ($\mathrm{CH}{}_3\mathrm{COCH}{}_2\mathrm{CHO}$, from the methyl-bearing end) and propanedial ($\mathrm{OHC}-\mathrm{CH}{}_2-\mathrm{CHO}$, from the central unit). Oxidative work-up would oxidise the dialdehyde to propanedioic (malonic) acid. Only the central unit is a dialdehyde, so the last statement is wrong.