Intellisense warning "Expression is always false" after modulo operation

Question

Consider this simple method that should round up a value to the next multiple of align:

        private long RoundUp(long offset, long align)
        {
            long evenBy = offset % align;
            if (evenBy == 0) // This line is underlined and Visual Studio means "Expression is always false"
            {
                return offset;
            }

            offset += (align - evenBy);

            return offset;
        }

The if statement is underlined and Visual Studio (2022) claims that the expression is always false. I can confirm with the debugger that both cases are followed in this test method:

        [Fact]
        public void TestRounding()
        {
            Assert.Equal(1024, RoundUp(1024, 1024));
            Assert.Equal(1024, RoundUp(100, 1024));
        }

What is the cause for this warning?

Edit: Here's a screenshot. No error code is given, unfortunately.