Google Says Order Of Disavow Link File Does Not Matter
Briefly

The order in which URLs are listed in a disavow link file does not affect how Google processes them. Disavow files are not processed in real-time; they are taken into account when Google crawls the web. Whether a URL is first or last in the disavow file does not matter. Google has indicated that disavowing links can often do more harm than good, with the possibility of removing the disavow tool in the future.
The order in the disavow file doesn't matter. We don't process the file per-se (it's not an immediate filter of "the index"), we take it into account when we recrawl other sites naturally.
If you don't trust this site and you add it to your disavow file, having it be the first URL in that file versus the last URL in that file, does not matter.
John Mueller of Google often says that disavowing links is a waste of time. Google may remove the disavow tool at some point.
Google stated that the disavow tools hurt many more sites than it helps and has doubled down on not using it.
Read at Search Engine Roundtable
[
|
]