PS: Im not sure if it is only for Multibranch Pipelines, but thats my current workflow, and the only one Im aware of.

 

Setting Refspec on the Configuration level:

 

Making sure that the refspec is honored:

 

But still when the branch runs, tags are fetched, but not the declared refspec:

 

 

I believe this a regression, since this has worked for me in the past.