Transform Undo broken in 2020

Pre-reqs:

1) PSUserConfig file with "TransformProportionalScale 0"

2) "Use Legacy Undo Shortcuts" toggled in Keyboard Shortcuts and Menus

Steps to repilcate issue:

1) record an action

2) transform a layer, then stop action

3) undo to revert layer back to original transformation

4) double-click the action to transform the layer again

Here's where the problem starts...

5) make adjustments to the transformation now and see if you can undo any of your transformation steps.

Undo within the transformation tool only works on fresh, non-recorded transformations.  If you record a "Transform current layer" step and come back later to adjust that step of the action, undo no longer works.

Edit: I tested this in CC 2019 and Undo works flawlessly there.  This error only occurs in CC 2020.