Your code is not runnable as you provided. (Compare that to my provided code block in my first reply. Hint: Note that I didn’t supply code as an image.)
As to your actual issue…
Please use my method to make image files and see if there is a difference? And/or try your code where I tried my test on a remote machine. ( I gave you another place to test things in my reply and asked you about your experience with that and you didn’t seem to try that or reference your experience with a more recent version?) It may be source of the files or size is involved? (My files had no real content.) Or maybe it is a permissions settings? Or maybe it is the length of the absolute path? As I described in my original reply, until you can make it reproducible in a shareable way, it’s an “on-my-computer” problem.
Hint: This guide will step you through how to make a post that is thorough and has a minimal reproducible example. Additional hint: I’ve described how to share code as formatted code blocks (see last paragraph) and there’s always gists at GitHub or other code sharing resources. Heck, you can even share an entire .ipynb file.
Additionally, if you cannot make this reproducible (or it was an old issue that was handled post-version 7.4 and you still want to continue to use the old 7.4 version), please consider how you could approach this differently. You can use commands to delete files of a specific type or entire directories easily enough using Python or other commands from in a notebook or on the command line.