If a tier 4 beacon is activated and regeneration is selected as the secondary effect, the beacon will always apply level II of the primary effect. As seen in the pictures, a beacon is placed with no pre-existing effects. Strength I and Regeneration I are selected. The beacon gives Strength II.
MC-132174
Tier 4 beacons will not give regeneration effect
Resolved
Fixed
10
Confirmed
Minecraft 1.13-pre4, Minecraft 1.13-pre6, Minecraft 1.13-pre7
Minecraft 1.13-pre8
Retrieved
Still in 1.13 pre6.