The bug

The biome "Jungle Edge"'s name is no longer accurate due to terrain generation changes. While in previous versions it would indeed generate as the borders of a jungle biome, 1.18 changes its role in world generation such that, in a similar fashion to MC-235684, this name no longer makes complete sense.

Expected behaviour

The biome would be renamed to something else to reflect it no longer acts as the edge of a jungle biome.

Actual biome

The biome's name and ID are still jungle_edge:

Notes

This may seem like a feature request, but the renaming of this biome was indeed discussed by Henrik Kniberg on Twitter: https://twitter.com/henrikkniberg/status/1430912589375094787?lang=en