After setting g:cb_no_default_brackets to 1, backspace goes to start of line

Describe the bug After setting g:cb_no_default_brackets to 1, backspace in insert mode moves the cursor to start of line.

To Reproduce Steps to reproduce the behavior:

Put "let g:cb_no_default_brackets = 1" in vimrc, and reload
Open any text file and move cursor to any text
Press "i" to go to insert mode
Press "Backspace"
See error: the cursor goes to start of the line

Expected behavior Backspace should remove a character.

Context

VIM - Vi IMproved 8.1 (2018 May 18, compiled Jan 6 2019 22:28:49), Included patches: 1-700 macOS version, Compiled by Homebrew
NVIM v0.3.4

Additional context vimrc:

if has('nvim')
    set runtimepath^=~/.vim runtimepath+=~/.vim/after
    let &packpath = &runtimepath
endif

set nocompatible
filetype off
syntax on
filetype plugin indent on
set modelines=0
set number
set ruler
set backspace=eol,start,indent

call plug#begin('~/.vim/plugged')
Plug 'LucHermitte/lh-vim-lib' | Plug 'LucHermitte/lh-brackets'
call plug#end()

let g:cb_no_default_brackets = 1

LucHermitte / lh-brackets

After setting g:cb_no_default_brackets to 1, backspace goes to start of line #21