Terrain shaper factor forces world generation to skip surface rule if it's value equals 0 (0 "works" for most cases, however exact value range depends of bottom slider offset value).
Data packs attached below contains following:
-overworld noise settings using terrain shaper factor at 0.4
-overworld noise settings using terrain shaper factor at 0.0
Related to MC-242332
Closing as Cannot Reproduce given world generation formats and implementation have changed substantially since this report. Please feel free to submit a new report if this is still an issue you are encountering - thanks!