CouchDB deleting and recreating document gives conflict

Question

I need to recreate a document in CouchDB. I use nano package, but I think the problem is the same with API calls. What I'm currently doing is to make two calls:

await dbHandle.bulk({docs: [{_id: "abc", _rev: "12-aaaa", _deleted: true}]});
await dbHandle.bulk({docs: [{_id: "abc", content: "...."}]});

But if I combine the two calls into one, the creation gives conflict:

await dbHandle.bulk({docs: [{_id: "abc", _rev: "12-aaaa", _deleted: true},
                            {_id: "abc", content: "...."}]});

But shouldn't the document be created with a different _rev value, so no conflict?

I agree that the difference between the two methods is minor, but I want to understand how deletions are synchronized. I have few problems during testing that seems caused by delete operations continuing in background somehow. Sure I'm doing something wrong, but I need to be sure.

Thanks for enlighten me!
mario