Starting command w/ space and pasting preserves old completion

[own2pwn]

Describe the bug

If execute a command that begins with space and pasting text thereafter, previous command is appended to that text.

To Reproduce

Steps to reproduce the behavior:

1. Start command with space, e.g. _echo '1' where _ means space
2. paste text, starting with space, e.g. _CMD+V
3. move cursor to the right(right arrow)

Expected: have pasted text only
Actual: pasted and previous command from 1.

Screenshots

screens

Desktop

• OS + distribution: macOS Catalina 10.15.4 (19E287)
• Zsh version: 5.7.1
• Plugin version: 0.6.4(ae315de)

Additional context

Problem seems to be with something related to MAGIC_FUNCTIONS, although seems to run fine with same config on High Sierra (though zsh version is 5.3)

[mindyourlifeguide]

@own2pwn, look - it helped me.

[tolpp]

It's looks like a duplicate of #351

Sourcing the code in this snippet solves the problem for me:
#351 (comment)