Parameter Action not working as expected - Filter from measure bubble chart to treemap on a dashboard

I am having a persistent issue with a Parameter Action and would appreciate any help. I have a dashboard with a bubble chart and a treemap. My goal is to click a bubble (representing a measure like 'Discount' or 'Quantity') and have the treemap dynamically update its size based on that selected measure.

1. My Goal:

To click a bubble in the bubble chart and swap the measure used for sizing on the treemap.

2. My Setup:

Bubble Chart: Measure Names is on both Color and Detail. Measure Values is on Size and Label. This creates separate bubbles for SUM(Discount) and SUM(Quantity).

Treemap: Sub-Category is on Detail. SUM([Treemap Value]) is on Size and Label.

Parameter: [Select Measure] is a String parameter with a list of values: "Discount" and "Quantity".

Calculated Field: [Treemap Value] uses a CASE statement to dynamically select the measure based on the parameter:

CASE [Select Measure]

WHEN "Discount" THEN [Discount]

WHEN "Quantity" THEN [Quantity]

END

Parameter Action: The action is configured to run on Select from the bubble chart sheet. The Target Parameter is [Select Measure], and the Source Field is Measure Names.

3. Crucial Diagnostic Result:

When I click on a bubble, the [Select Measure] parameter control on the dashboard DOES NOT change its value. This indicates the action is not firing.

4. Attachments:

Please see the attached screenshots of my worksheet setups, parameter configuration, and dashboard action dialog. A packaged workbook (.twbx) is also available upon request.

5. My Tableau Version: 2022.3

I am completely stumped. Any insight into why the action might not be firing despite this setup would be incredibly helpful. Thank you!