Why Visual Studio's Database Profiler shows "unknown" results?

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I'm trying to use Visual Studio's Database Profiler following Microsoft's documentation. Everything seems to work as described but in the report, I get unknown values, except very few queries (4 out of hundreds) in which all data are populated (screenshot is cut).
Any ideas why this is happening?

profiler report

Visual Studio version: Community 2019, Version 16.9.5.

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