The 68010 was indeed pin compatible with the 6800 and had only 24 address bits. But the 68012 (which was otherwise software compatible with the 68010) extended

The 68010 was indeed pin compatible with the 6800 and had only 24 address bits. But the 68012 (which was otherwise software compatible with the 68010) extended the address bus (and had more pins) and was the first m68k CPU to exhibit this compat issue. The 68020 was more popular but came a couple of years later