FocusLost event sometimes does not fire when pane with vim inside is zooming

[hoango7604]

I recently install this plugin in order to trigger FocusLost event and fade vim inside inactive tmux pane using TaDaa/vimade. Everything works fine, except for when vim is inside tmux pane which is being zoom and then I switch to another pane, sometimes it fades and sometimes doesn't.

Details:

• OS: MacOS
• vim version: 8.2.
• tmux version: 3.1c
• terminal: iTerm2

My vim config: config repository

Expected behavior: Vim immediately fades after switched from it's containing tmux pane to another pane.
Actual behavior: Sometimes Vim fades and sometimes it doesn't.

Attachment: