Information

Full output of /ess version:

Server version: 1.16.1-R0.1-SNAPSHOT git-Paper-135 (MC: 1.16.1)
EssentialsX version: 2.18.0.8
PlaceholderAPI version: 2.10.8
PermissionsEx version: 1.23.4
Vault version: 1.7.3-b131

Server log: https://gist.github.com/ElectricEzo/251c1e3d404466a6b548e07da09eb113

EssentialsX config: https://gist.github.com/ElectricEzo/2c727f4b203632273b28a11c9947cf7c

Details

Description
When using /potion or having potions in kits, potions with health boost power 4 have power 5 and potions with health boost power 5 have power 6. This means that potions cannot have health boost power 4 on them.

Steps to reproduce

1. Get a water bottle.
2. Do /potion effect:healthboost power:4 duration:100 (any duration works)
3. Notice that the potion has Health Boost V, not Health Boost IV
4. (Extra) Do /potion effect:healthboost power:5 duration:100
5. (Extra) Notice that the potion has Health Boost VI, not Health Boost V

Expected behavior
I expected to have gotten a potion with the appropriate health boost level.

Screenshots

As of EssentialsX 2.18.0.23, you can now replace power: with amplifier: in item meta to use raw potion strength values (which are 1 lower than the display name). This means for an effect of strength IV, you can now use amplifier:3 in place of a power value.