Renaming results in missing code

I changed the name of the screen yesterday, and then I continued working on the file some time,
all is ok ,
but today,
i can’t find the controller,
i open the screen and do nothing ,then close it ,it hint me to save changes,i show the changes,but nothing,
why?
%E4%BC%81%E4%B8%9A%E5%BE%AE%E4%BF%A1%E6%88%AA%E5%9B%BE_20181010095035
the controller become null:
%E4%BC%81%E4%B8%9A%E5%BE%AE%E4%BF%A1%E6%88%AA%E5%9B%BE_20181010095454

this is version:
%E4%BC%81%E4%B8%9A%E5%BE%AE%E4%BF%A1%E6%88%AA%E5%9B%BE_20181010095645

after i renamed,i had edited the sereen and runed it,
today i start computer and open cuba,Bad things happen

Hi,

Unfortunately we can’t reproduce the issue.
Is there some other details that can help us to find the problem?

It is highly recommended to use version control system (e.g. Git) to keep your code backed up.

sorry,i also can’t reproduce the issue
i had write the code agin.
Fortunately, there’s not a lot of code

I think it’s a caching issue