VS theme seems to have limited support of possible classes comparing to default themes which come with Prismjs.
Please find below same code block highlighted with VS and system Coy theme
$ podman run -d --name myPG -p 5432:5432 -e POSTGRES_PASSWORD=postgres postgres:alpine
$ git checkout master
foo@bar:/$ cd ~
foo@bar:~$ sudo -i
VS theme

System Coy theme

Issue might be in non-whole set of classes defined in VS theme. For example, Coy theme defines token.important class color
.token.important {
color: #e90;
}
In contrast VS theme doesn't have it.
Tagging author as the most revelant person @andrewlock
VS theme seems to have limited support of possible classes comparing to default themes which come with Prismjs.
Please find below same code block highlighted with VS and system Coy theme
VS theme

System Coy theme

Issue might be in non-whole set of classes defined in
VStheme. For example,Coytheme defines token.important class colorIn contrast
VStheme doesn't have it.Tagging author as the most revelant person @andrewlock