Data dependent animation jump when regroup strategy is drilldown

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During the transition from the '5 Filter Off' slide to the '6 Prod Category' slide, all the data sets remain the same, except I remove the second data set from the X-axis. However, the circles still converge into one column and then "gather" into positions based on the remaining data set.

[simzer]

Reproduced in JSFiddle: https://jsfiddle.net/simzer/unqh4019/
Could not reproduce with simple dataset.

[schaumb]

Simplified dataset: https://jsfiddle.net/t154g9hs/

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This is caused not by transition but by markers handling data.
The intermediate step generates a keyframe that is wrongly displayed.
When the data contains independent dimension values, the following chart is rendered unacceptable:

{
  config: {
    channels: {
      y: 'M1',
      x: 'D1',
      size: 'D2'
    },
    geometry: 'circle'
  }
}

The bug still appears if it is used D2 in other channels, like noop.

The other bug: In this case displaying the chart depends on the order of the data.

[schaumb]

Postponed after new Dataset