Blueprint property values will be reseted after add a new property

Blueprint property values will be reseted after compiled with a new property added. I updated the engine to 4.18 today and this bug came up which is working fine in 4.17

First, I create a new project,then create a new actor and a blue print which inherit the actor.And add code like this

220789-a1.png

Second,compile and give a value to test1

220790-a2.png

Third,add a new property to myactor.h .

220791-a3.png

In the end,compile and the value we have given is gone

220792-a4.png