LR sometimes imports some (not all) duplicates from my iPhone 13 Pro Max

I've been using LR Classic for quite a while (2011 I think), first with a Canon, then added an iPhone and an Olympus.  I have only one cagtalog to keep life simple.

I always click "don't import susptected duplicates"

For the Canon and the Olympus never a problem.  

With various iPhones I have to pay close attention because sometimes it WILL import SOME duplicates, sometimes it gets it exactly right with no intervention.  

I have all the latest operating systems and versions as of 13 August 2024

• iOS 17.6.1
• macOS Sonoma 14.6.1
• LRC 13.4
• Camera RAW 16.4

I'm on a 2020 M1 Mac Mini and using an iPhone 13 Pro Max.

Typically I format the SD cards on my Olympus after import.

But I like having as much history on my iPhone as possible so I don't delete much.

Today I did all the steps very slowly and carefully - I have screenehots along the way.

I did an import from the iPhone just yesterday, so there were only about 4 images to import

But LR wanted to import many more.

I unchecked some of the days and let two of the days go through - sure enough there are a bunch of files with -2 at the end of the filename.  Easy enough to search and delete.

But why do I have to be so careful?

There have been times when this isn't a problem - it seems to be intermittent.

Do I need to wait some minutes for LR to figure out the duplicates?  

Here's an image of the sidebar showing what LR wants to import from my iPhone when I just did an import yesterday.