I've started a long project in my solo world- destroying the entire central end island, while doing so, I've discovered an interesting issue.
Haste 1 given by beacons gives absolutely no speed increase to mining. Only haste 2 and above has an effect.

Steps to reproduce:

• Create any world
• build a beacon in either creative or survival, it doesn't matter
• obtain a netherite pickaxe with effeciency 5, for best visualization.
• place some obsidian to mine with the pickaxe
• activate the beacon to have level 1 Haste
• Begin mining the obsidian, observe how long it takes to mine
• disable the beacon
• Mine the obsidian again, observe that it takes the same amount of time to mine as it did without haste 1

Observed Results:

Mining speed doesn't change whatsoever

Expected result:

Level 1 haste should give a 20% speed increase to mining, while level 2 should give 40%