Problems with reading CR3 files in LRC for Mac

working on this reply, additional research after first posting leads me to rethink it.

The images that do import vs the images that do not import, Is the issue, Dual Pixel RAW off vs on?

The Adobe Camera RAW supported cameras page,  (ref 1) has a note about 'Dual Pixel RAW files', that note is a link to (ref 2).  Anf that document talks about working around a LrC limitation .

(ref 1): https://helpx.adobe.com/il_en/camera-raw/kb/camera-raw-plug-supported-cameras.html

(ref 2): https://helpx.adobe.com/il_en/x-productkb/multi/editing-canon-dual-pixel-raw-cr2.html

I see that you are new to the community, a nice How to Guide in link below

https://community.adobe.com/t5/using-the-community/community-how-to-guide-tips-amp-best-practices/m-p/11601738#M47075

From that document:

Supply pertinent information for more timely and effective answers
The more information you supply about your issue, the better equipped other community members will be to answer. If you're unsure on how to do this, you can copy and paste this template:
 
*************
Explanation of the issue including what you were doing when the problem occurred, what you were trying to achieve, and any other information you may think is useful.
Adobe product and version number 
Operating system and version number 
Error message(s) (if applicable)
Computer hardware, such as CPU; GPU; the amount of RAM; etc. 
Screenshots of the problem (if applicable)

See: https://helpx.adobe.com/camera-raw/kb/camera-raw-plug-supported-cameras.html

IF your camera is so new, it isn't listed here, nothing you can do for the time being. 

Every time Canon (or Nikon, or Sony etc) release a new cameras, they do this stupid trick of making yet a new proprietary raw file that everyone outside the company, including Adobe need access to so they can 'hack' the tiny differences to support that new proprietary raw. You the customer get to wait and are forced to use the manufacturers raw converter until this all takes place. It is silly but that's how it has been for decades. 

Please give us the exact make and model of your camera, and the exact version NUMBER of your Lightroom Classic (we need the version NUMBER and not words like "current" or "up-to-date").

Also, please provide the exact unedtied word-for-word error message. If there is no error message, describe what happens and show us a screen capture.

Also, you are saying that SOME OF the raw photos can't be imported into Lightroom Classic? And other raw photos can? Am I understanding this correctly?