Also, I noticed that when I reverted the entire project, there was a float variable in the parent class called “Lifespan.” However, every time I restarted the editor, this variable reverted to its default value. After some trial and error, I realized that Unreal Engine was interpreting it as the built-in variable “Initial Lifespan” without any warnings. Therefore, I recommend checking your variable names and considering renaming them, as it may resolve the issue.