Thanks for reaching out. I'd love to help you figure this out. We are here to help.
Could you please confirm the version of macOS you are working on right now? Is the new MacBook Pro based on Apple silicon (M1 Series) or intel-based? Have you recently imported a large batch of images? Does this happen with any specific file type or range of images, or is it just random?
Please follow these steps to launch Adobe Lightroom from the Terminal.
Quit Adobe Lightroom.
Go to Finder > Applications > Adobe Lightroom
CTRL-click or right-click on the launcher of Adobe Lightroom and choose 'Show Package Contents.'
In the following window, go to Contents > macOS folder > Adobe Lightroom (with the terminal logo)
Open Lightroom once and check if the previews are generated.
If this does not work, it could be related to Sync issues.
I have the MacMini M1 series. I had imported a large batch of photos. Around 86. I work with RAW image files. It appears to happen randomly. It has just happened again on another batch of photos I am working on. I was working on the image and it seemed like the computer was not processing the action I was doing and then it was like the computer froze. I quit LR and opened it back up and now I am unable to access this one image to edit it. It appears in the thumbnail but will not come up with I click on it.
I was not able to perform the fix you recommended. When I right or control click on the LR icon I do not get the option to choose 'show package contents'