Joining lines with empty line adds 2 spaces when joined

[erf]

Summary

Joining two lines with an empty line between adds 2 spaces when joined. In vim only a single space is added. No space should be added on empty lines.

A weird features is that if i move the cursor to the middle empty line and press J then move the cursor to the first line and press J there is only a single space.

Reproduction Steps

Given the following text:

abc

def

I tried this:

1. hx
2. JJ

I expected this to happen:
abc def

Instead, this happened (2 spaces between is not shown in markdown):
abc def

Helix log

~/.cache/helix/helix.log

please provide a copy of `~/.cache/helix/helix.log` here if possible, you may need to redact some of the lines

Platform

macOS

Terminal Emulator

Wezterm 20231122-174138-6a58a5ce

Installation Method

brew

Helix Version

helix 23.10 (f992c3b)

[TornaxO7]

I can tackle this