Expose on spawn Blueprint 4.18

After updating the project from 4.15 to 4.18 I have a trouble with expose on spawn in blueprint
Here is My BP with expose on spawn blueprint, default value is 10

In Second BP I trying to spawn 1st BP and set expose on spawn value 50

As a result it shows me value as 10, but if I click compile so it works and shows 50, so I click save restart my editor and it again show 10

In 4.15 it worked ok, but in 4.18 this trouble confusing me

Is this a project created in 4.18? Or upgraded from a previous engine version?

upgraded from 4.15 to 4.18