Frosted Ice melts with randomTickSpeed set to zero

/gamerule randomTickSpeed 0
/setblock -45 101 -9 minecraft:frosted_ice 

Watch the block start to melt.

randomTickSpeed should govern the speed, I expect this to not melt at all. I'm thinking that maybe MC-99411 was fixed to ignore randomTickSpeed instead of studiously obeying it? At least at zero, that's what seems to happen