ALEWarning and ALEInfo highlights are not cleared properly

[pbnj]

Environment:

• OS: macOS 10.15.7 (19H512)
• Vim (:version): VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Dec 28 2020 12:55:00)
• Terminal: iterm2

If you have a trouble with coloration and are using Vim/Neovim with terminal:

• Does your Vim support full colors? (:set termguicolors)
• Does your terminal support full colors? (e.g. Terminal.app doesn't support it)

Problem

ALEWarning & ALEInfo don't seem to be cleared properly initially.

:verbose hi ALEWarning
ALEWarning     xxx links to SpellCap
        Last set from ~/.dotfiles/vim/.vim/plugged/ale/autoload/ale/highlight.vim line 14

:verbose hi ALEInfo
ALEInfo        xxx links to ALEWarning
        Last set from ~/.dotfiles/vim/.vim/plugged/ale/autoload/ale/highlight.vim line 22

Once a file is opened and all plugins have loaded, if I source $MYVIMRC again, highlights are fixed:

:verbose hi ALEWarning
ALEWarning     xxx cleared
Press ENTER or type command to continue

:verbose hi ALEInfo
ALEInfo        xxx cleared
Press ENTER or type command to continue

Steps

• Minimal vimrc to reproduce:

set nocp

call plug#begin('~/.vim/plugged')
Plug 'https://github.com/dense-analysis/ale'
Plug 'https://github.com/cocopon/iceberg.vim'
call plug#end()

filetype plugin indent on
set termguicolors
colo iceberg

• open file with ALE warnings/info (highlights should be visible)
• source .vimrc (highlights should disappear)

Screenshots

At first open:

After source .vimrc: