Altitude Condition not working in the nether

Altitude condition registers perfectly in the overworld; however upon entering the nether - the condition breaks down and doesn't function as intended.

Steps to reproduce - create a skill that utilises the altitude condition (example, require altitude > 2) and enter the nether

Expected outcome - skill should function as intended, mirroring the success of the same skill in the overworld

Actual outcome - condition doesn't recognise the altitude of the caster (in this example, despite being greater than 2 blocks from the ground, the skill refuses to proceed)

Suggestions to fix - revisit how altitude is derived, and incorporate the difference when the caster is in the nether

Cheers~!