Stacked Transform effects cause zoom to drift toward top-left despite centered anchor point

Premiere Pro version: 26.3.2
Clip resolution: 1920 × 1080

Steps to reproduce:

1. Add a clip to a sequence and apply two Transform effects to it.

2. With the first Transform, animate Scale from 100% to 130%.

3. With the second Transform, animate Scale from 100% to 70%, overlapping the two animations.

4. Play or scrub through the zoom. The anchor points are centered.

Expected result: The zoom stays centered.

Actual result: The image drifts toward the top-left, as though the second Transform is scaling around a different point. If I disable the first Transform, the second zoom stays centered on its own.

Additional testing:

• The issue occurs with multiple clips and in a new sequence.

• Resetting the Transform positions and anchor points did not resolve it.

• Changing the order of the effects did not resolve it.

• The drift remains with Program Monitor playback resolution set to Full and shutter angle set to zero.

• Nesting between the two effects corrected the centering, but the nest can crop the image outside the sequence frame and affects performance in my workflow.

I need to overlap the two Transform animations for the desired zoom transition, while retaining the full image for the zoom-out.