Header background is being applied intermittently using Site Script in communication site

Hello All,

The problem is that while I am using some of the verbs in conjunction with the "setSiteBranding" in the site script, the header background color is not always set.

I've noticed that the site template functions flawlessly when I apply it to an already-existing site, but it only occasionally—not always—works when I use it to create a new site.

Can anyone please assist me on this?