Hello there @Knoopmas!
Checking through the community, this is a recurring scenario, with multiple causes. Let’s cover a few possible resolutions:
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As a first step, to rule out pre-existing elements on your system, please update your OS to the latest version, and update your video drivers to the Developer version (pick the “Clean Install” option if available)
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Disable MRQ tiling, as its combination with VSM is a usual suspect for causing artifacts.
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Disable Virtual Shadow Maps entirely, and test with traditional shadows or ray traced shadows instead
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Force your foliage to fixed LOD, preventing LOD transitions during render
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If you are using Nanite, test disabling it, as it may cause strange shadow effects on render