Hadd two files, but TTrees dont combine, only the TH2F's do

I am trying to hadd two .root files together in an ordinary way. The two files have idenitcal structure in terms of branch names.

Each file has a few TTrees and a single TH2F. When I hadd the two files, the TH2F is all that appears in the combined .root file.

Does anyone understand the issue?

Yes that’s weird. Can you post a reproducer if your files are not too big ?

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