I was testing a fun build (superior rune of the vampirism ad sigil of blood) and several time i noticed during soloQ that my runes were bugged, i didn’t take the leech from healing (i didn’t notice leech buff appearing and there weren’t nothing also in combat log). Often they bugged at beginning of soloQ, sometimes also during match. I noticed a similar problem with sigil of blood, it procs too rarely despite 5s recharge, looking at the combat log confirmed my thought (i was playing a build with assassin amulet and fury, so near 83% critical and unload spam).
I hope this will be helpfull for some fix ^^
R.I.P. thieves