Using sfdisk, when one specifies a start offset different from the default for the first partition I'd expect that the second partition starts at the end of the first partition. This is true when gpt ...
When using the advanced example in the config documentation it gives a number of warnings on v1.6.0. When changing to 1.5.0 these warnings are not present. When checking the 1.5.0 to 1.6.0 upgrade ...