The behavior on both of these builds is actually correct. Keep in mind that the problem was that the delete was getting dropped from the backup file during compaction. On 4.5.1-2855 you're seeing the deleted document restored with an empty body due to
MB-21924. While the overall behavior is incorrect because of the bug we can see that this issue is fixed because it is clear that the delete was not dropped from the backup file.
On 4.5.1-2856 you are seeing the correct overall behavior since
MB-21924 is fixed on that build. The problem with you testing as I pointed out on the other issue is this comment:
"get failed on the document with key not found error and metadata could not be retrieved using views"
Verification of backups should always be done using get meta and not get because get meta will retrieve delete item tombstones and in general provides more information about the restored data since it includes the items metadata. I also don't trust views to be a source for verification of backups.
I just re-ran your test case and am seeing the delete in the couchstore files.