not(var.nil?) gets wrongfully converted to not var.nil? which can lead to invalid ruby code

[onvbqalc]

• Ruby version: 3.1.2
• Rubyfmt git sha: e00d2ab89fd4b0b85a7897fac393c1ad987136de

==> rubyfmt: stable 0.10.0 (bottled), HEAD
Ruby autoformatter
https://github.com/fables-tales/rubyfmt
/opt/homebrew/Cellar/rubyfmt/0.10.0 (8 files, 15.4MB) *
  Poured from bottle using the formulae.brew.sh API on 2024-01-07 at 04:41:02
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/r/rubyfmt.rb

Input file

class MyClass
  def my_method
    a.nil? || not(b.nil?) || c.nil?
  end
end

Rubyfmt's output

# First format - no output but brackets () are removed
# leaving conditional as: a.nil? || not b.nil? || c.nil?
#
# Second format:
Rubyfmt detected a syntax error in the ruby code being executed

This breaks because

Code should have been left as-is on the first format - instead, it got converted to invalid ruby code:

a.nil? || not b.nil? || c.nil?

(is not valid ruby)