That absolute positions must be stored in the debug maps (_attrStart, _attrEnd, _arrStart, _arrEnd). Without that it is impossible or too hard to determine correct position of parsed objects, especially of instances objects.

For example, consider following KSY:

meta: id: offsets seq: - id: padding type: u1 - id: unsized type: type - id: sized type: type size: 10 types: type: seq: - id: padding type: u1 - id: unsized_simple type: u1 - id: sized_simple size: 1 - id: unsized_array type: elem repeat: expr repeat-expr: 2 - id: sized_array type: elem size: 3 repeat: expr repeat-expr: 1 elem: seq: - id: padding type: u1 - id: value type: u1

The following problem is currently being observed:
This show correct location

That location is wrong, must be inside previous region: