These changes were done to mace in 1.16.2.0:

• Mace
  • Attack speed decreased 10%
    • Standard: 0.4 > 0.44
    • Heavy: 0.7 > 0.77
  • Damage increased 25%
    • Standard: 65 > 81
    • Heavy: 140 > 175

This actually did not affect the whole mace family. Only mace was affected by these changes.

In fact, oddly enough, sun's grace and flail, both uniques of the mace actually have faster attack speed than before, while keeping their old damage.

With +125% attack speed, sun's grace and flail used to have 3.8 hits per second before the update. Now they have 4.1 hits per second.