Hi @Mikkel
Yes, it is required.
(If I had done this directly on the main branch, then the process would work, the Analyze step does NOT fail then, it creates the project in sonar cloud for me.)
The fact that it is working comes from a deprecated behaviour and it will be dropped someday (without notice), so I would not recommend to go on with this.
Only idea I have is to take a look at the web Api, maybe you will find something interesting for you 
HTH.
Regards,
Christophe