Expected behavior

After enabling Performance/Sum, I expect that the following lines will all be autocorrected to use sum:

[1, 2, 3].inject(:+)
[1, 2, 3].reduce(10, :+)
[1, 2, 3].reduce { |acc, elem| acc + elem }

Actual behavior

It only autocorrects the second line:

[1, 2, 3].inject(:+)
[1, 2, 3].sum(10)
[1, 2, 3].reduce { |acc, elem| acc + elem }

Steps to reproduce the problem

1. Create a test file with those lines.
2. Run rubocop -A
   OR
   You can replicate this bug by pulling down this project, doing a bundle install, and running rubocop -A

RuboCop version

rubocop -V
0.91.0 (using Parser 2.7.1.4, rubocop-ast 0.4.2, running on ruby 2.7.0 x86_64-darwin19)