This has been brought up before, but not in a separate topic. (Not sure if it’s logged on GitHub, or how to do so.) Please fix default New Zealand rules komi for 9 x 9 and 13 x 13 ranked games from 5.5 to 7.0. (19 x 19 ranked games already have 7.0 komi by default.) This is separate from the issue of how OGS handles ranked ties (correctly, but only by moderator decision during the scoring phase; known issue with a promised fix in the indefinite future).
Footnote: KataGo as implemented on OGS shows that 5.5 Chinese komi clearly favours black for both 9 x 9 and 13 x 13. Under New Zealand rules, it being an area scoring ruleset like Chinese, 6.0 komi is equivalent to 7.0 komi since each intersection is worth two points.