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Make sure that both the TCP preference "Allow subdissector to reassemble TCP streams" (as per Chris Maynard's comment) and the DIAMETER preference "Reassemble Diameter messages spanning multiple TCP segments" are both enabled (the checkbox has a check in it).
Go to Edit > Preferences on Windows or UN*Xes (such as Linux) that aren't macOS, or Wireshark > Preferences in macOS, and look under "Protocols" for those preferences (each protocol has an item under "Protocols"; look at the items for DIAMETER and TCP).
