Can you try the following steps to make sure the Set Variable action has the appropriate target value type:
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Open the rule for editing and edit the impacted Set Variable block
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Switch the ‘Source’ to Manual Input and then back to Expression*
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Save the Set Variable block and then Save your rule
You should be able to run your rule again and it will pick up the proper inferred value type for the expression. Video demonstration attached.
*The expression should be retained when switching the source to Manual and immediately switching it back to Expression, but you can always copy the expression to your clipboard as a precaution.