Thank you for the suggestions @brs-sebascova !
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There is no difference between virtual and normal shadow maps.
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TSR and TAA do hide the pattern to some extent but it’s still there. Temporal approaches are not something I want to include for other reasons.
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The normal maps seem to be correct and the effect happens with several different ones.
What is interesting is that the issue does not occur for materials with parallax mapping effects. Otherwise it does happen with several other materials where a point light gets close to a shadow casting surface.
The issue is also solved by baking the lighting and shadows in the scene.
I wonder if there are any settings that would allow for better handling of close proximity point lights?