AutoNotification Progress bar using a decimal value

I have an action that returns a variable populated with a number to 1 decimal place e.g. %value=3.4.
If I used this variable %vlaue in the progress bar, it does not 'fill' the bar to this value.
Note, I have set the max value field.

Is this a possible bug?

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Indeed it does yes

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Anyone got any ideas?

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