Is it weird that I get staffed OFF of deals?

Been running into this strange situation at my firm repeatedly now and wanted to see if I'm totally misguided in thinking it's weird af. For context, current 1st-year MM PE Analyst with a strong finance background. I've technically been "on" a few deals so far, but I keep getting brought on to do 1-2 workstreams and then I get literally staffed OFF of the deal after a week or two. Like I'll go from being a part of the deal team to being left off every email chain overnight. Worst part is, these are often the most boring, simple, qualitative workstreams as well so I'll be grinding while not learning anything, and I won't be able to even put the deals on my resume. For instance I'll take 200+ pages of call notes on a deal that I'm supposedly being staffed on, and then bam once I finish this I'm not on the deal anymore. 

I've brought this up repeatedly but my firm seems to think it's fine that random deal teams keep bringing me in to do some one-off work for them, vs. actually putting me on a deal that I can see from start to finish. Is this type of thing common for PE Analysts? I can't imagine I'll ever learn to be a competent PE Associate this way.