Overwrite color of subproject

Greetings fellow Taskwarriors!
I want to use distinct colors for subprojects. So in my color.theme I have the following:
```
rule.precedence.color=deleted,completed,active,keyword.,tag.,overdue,scheduled,due.today,due,blocked,blocking,recurring,tagged,uda.,project.,

color.project.A=color1
color.project.A.subA=color2
```

However, it seems that only the rule for project A is applied and the subproject is colored with color1.
If I only use the second color rule, the subproject is colored correctly but not the parent project.

Maybe I'm missing something?