Crit dmg runes and on-hit effect abilities

I noticed that Yasuo Q and Gangplank Q is not getting the bonus of the crit dmg runes (+46% crit dmg if every rune gives crit dmg).

For example (without infinite edge): I have 100 dmg with GP. So my basic crit(with runes) is 246 dmg. But i my Q(lvl 5) crits it is 120+200=320. (it is hardly noticeable that there is missing dmg) But when i have 400 dmg. Basic attack is 984, and Q is 920. (if we calculate as 120 from ability and 984 from on-hit with crit we get 1104, so i deal 184 less dmg)

And i think that is a bug. Becouse on-hit effect should be at least as strong as basic attack. I assume every ability that can crit is not getting bonus from runes. AND the rune's description doesn't say "only basic attack".