active_buffer delimiters aren't applied if setted on vimrc

[filipebarros]

I have set in my vimrc file the characters for the active buffer left and right

let g:bufferline_active_buffer_right = "]"
let g:bufferline_active_buffer_left = "["

but it is not applying these changes and applies the other changes (tested bufnr, solo_highlight and modified and all of them work).

using those commands inside a vim session it applies the changes correctly.
I have tested this with the minivimrc you provide and the same thing happens.

[filipebarros]

vim-airline was overriding these settings.