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It looks to me as if the damper is not doing its job.
After retrace, the 6BG6 will be switched hard on to effectively dissipate the energy stored in the deflection coils. The left hand side of the image shows severe ringing which suggests the damper is not working.
I would check/substitute the 6BG6 damper and check the waveforms around it on a scope. If R19 is open, I would expect the result you observe.
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