As mentioned in the title the mastery Meditation isnt working. I tried it in custom games and in ranked on Sona and Nautilus. Neither of the Manaregvalues (be it the basic or the additive values) is changing with amount of used mana.
I dont know if it is just not displayed or really not working.
Zombiemaster1 votesI believe that the Meditation mastery doesn't actually add anything to your mana regen value. It just instantly restores the amount of mana every 5 seconds.
Crang1 votesWEll that could be the case. Wasn't counting the actual mana gain. But then, the behaviour is at least confusing, because u can't look it up anywhere.
If they want constant values for basic mana reg and mana reg from items in the stat summary, they could add a 3rd value accounting for this masterie if its the onl of the sort.
But then the overall value is changing again. Hm, difficult case.
thx for the answer
ZerglingOne1 votesWEll that could be the case. Wasn't counting the actual mana gain. But then, the behaviour is at least confusing, because u can't look it up anywhere.
If they want constant values for basic mana reg and mana reg from items in the stat summary, they could add a 3rd value accounting for this masterie if its the onl of the sort.
But then the overall value is changing again. Hm, difficult case.
thx for the answer
That is the case. It's to prevent 
passive from influencing the amount of mana regenerated. Just get your mana close to 0 and watch its values. Every so often it will jump up suddenly.