This may be intentional, but I figured I'd report it anyway. When the option "Keep moved files in file list" option is unchecked, then using an action to edit _FILENAME which results in moving the file to a new folder, files are not removed from the list. I suspect this option was only intended to take effect when using Edit>Move. There's a very old thread mentioning a similar thing but it may have been before this option was implemented.
Here is a thread that explains the behaviour:
Could you check if that is different from what you experienced?
That thread only talks about using Edit>Move, which does work as expected, honoring the "Keep moved files" setting.
It also explains which files will still be displayed regardless of the option's setting.
You would have to check whether the files that you want to disappear can still be found in the current working directory and its sub-directories.
The files are being moved out of the working directory.
Yes, it's currently only applying to files being moved via Edit → Move...
Can you just use Edit → Remove Del to remove those files from the File List?
I could, sure. But I was hoping for it to be automatic, so that after I run my final action that moves the files, they are cleared from the list automatically so that there's no potential confusion over whether I've run the final action or not on that set of files.