[Suggestion] Pitch40 elytra fly under bedrock

[soshimee]

Describe the feature

I can't input negative y coordinates into elytra fly's max/min bounds.

Before submitting a suggestion

• [X] This feature doesn't already exist in the client. (I have checked every module and their settings on the latest dev build)

• [X] This wasn't already suggested. (I have checked every suggestion on github)

• [X] This feature is a valid suggestion. (I have read the FAQs and Guides)