The copy overloads:

    static void copy(MemorySegment srcSegment, long srcOffset,
                     MemorySegment dstSegment, long dstOffset, long bytes)

And

    static void copy(MemorySegment srcSegment, ValueLayout srcElementLayout, long srcOffset,
                     MemorySegment dstSegment, ValueLayout dstElementLayout, long dstOffset,
                     long elementCount)

Refer to 'this segment' in their javadoc:

    If the source segment overlaps with *this segment*...

This should the 'the destination segment' instead. Since both of these methods are static, there is no 'this segment'.