With this comment Wrong results of "Average resolution days"? - #3 by oskars.laganovskis and a little bit of testing I got the knowledge that “drill through issue” hides entries with very small numbers (near to 0.00) even if it counts this issues (e.g. when calculating an average).
So there weren’t null values after the import and therefore CoalesceEmpty couldn’t work because there weren’t any null values.
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