exFAT ignores Cluster Size and small files always become 1MB

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I use an external 4TB SSD and try to format it with the smallest possible Cluster Size. In the Windows Format Dialog the smallest Cluster Size is 256KB: When I format the disk with 256KB and also check the Cluster Size via Powershell:

PS C:\Users\Someone> (Get-Volume D).AllocationUnitSize 262144 

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Files still use 1MB of space instead of 256KB: Someone know how to change the Cluster Size to a smaller Value then 1MB ? I also tried other Cluster Sizes:

format D: /FS:exFAT /V:Samsg_4TB /Q /A:4096 // Becomes 1MB per small File format D: /FS:exFAT /V:Samsg_4TB /Q /A:64K // Becomes 1MB per small File format D: /FS:exFAT /V:Samsg_4TB /Q /A:128K // Becomes 1MB per small File format D: /FS:exFAT /V:Samsg_4TB /Q /A:256K // Becomes 1MB per small File format D: /FS:exFAT /V:Samsg_4TB /Q /A:512K // Becomes 1MB per small File format D: /FS:exFAT /V:Samsg_4TB /Q /A:2M // Becomes 1MB per small File 

When always checking the Cluster Size with (Get-Volume D).AllocationUnitSize it's always correct corresponding to the set Cluster Size with the format command but the resulting small Files Size is always 1MB. When I duplicate those small some bytes Files it fast results in huge Memory wastes: enter image description here" /> I wonder when I use another Computer and check the File properties they are correct: enter image description here" />