Guys, i have a solution to this bug.
You will need a memory editor,
Download Cheat menu RPGmaker MV
Do the quest normally until unlocking the gate part , then stop and search in the variables list by "ladder" ,with value 2 , change to 1 B͇E͇F͇O͇R͇E͇ go to the back of the house. The damn stars should appear normally now
edit:
Detailed way:
1 - Download and extract this script in the .exe dir and install him with "CheatMenu installer .vbs"
View attachment 356052
2 - Run the game, go to the buggy part and press the "L" key. When you see this window, Select "Variables"
View attachment 356046
3 - Find the "ladder" variable and change value from 2 to 1. Return to game and be happy
View attachment 356047