In TLJ, there’s a scene where they reuse an OT soundtrack for a little bit. Not a motif, not a phrase, an entire track. I bet that this was a test run, and that we’d be seeing a lot more of that in the future.
In Solo, there’s an entire scene whose entire purpose seems to just be reusing OT soundtracks. Then in TRoS, the entire movie reuses OT and PT soundtracks the whole time.