`vim.g.nord_enable_sidebar_background = true` has no effect

[TRPB]

I have the following config:

vim.g.nord_disable_background = true
vim.g.nord_enable_sidebar_background = true
require('nord').set()

However, the nord_enable_sidebar_background option has no effect. My terminal is transparent and both the sidebar and main text area are transparent even with this option enabled: