This seems to happen every update
We have been experiencing the same issue. Mobs spawn on glass, slabs, path blocks, leaf blocks, buttons and are ignoring light levels, our realm has been in peaceful mode for since the update and it's extremely unpleasant, this needs to be fixed and i agree, sost adding new things that create more bugs just fix the current bugs please for the love of God
On our dedicated server we also replaced the jar file with a new updated one and it still will not work, tried removing white list and readding and nothing is working