The Squire + Awakened Minion Support

Previously, Awakened Minion Support socketed in The Squire gave skill gems in main hand +1 lv.

Now it doesnt. Was this intended or nerf?

It wasn't changed, and PoB of your character shows it as working correctly.

The gems on the mace are lv 21.

Having the +3 lv to Empower give +6 to sklill gems.

Having the +1 lv to skill from the mace

The Awakened Minions Damage in The Squire should give another +1 making them lv 29.

But it is only lv 28 (The +1 lv from The Squire is not being added)

PoB does show all of your gem levels being added properly, so my guess it's purely an in-game tooltip issue. It could be that the gem tooltip just doesn't get updated properly to show that +1 since the minion damage gem is in the Squire, instead of being a local support or global +1.

I don't have the means to test it myself, as I nuked my only Squire in the Temple not long after I got it lol. Maybe try moving your Empower into your shield to test, and see if it shows the +levels from that on your zombie gem.

Just swap the gem into your weapon and see if you get different results. If you get different results, you can report it as bug.