P: Poor photo in the library and develop module - smart previews

To see the full size image on Windows I right-click and select 'View Image.' You can then download the file or click the + icon to Zoom 100%. Here it is at 200% Zoom to better see the noise artifacts.

What the other thread solved was the fact this is an issue that doesn't affect everyone (perhaps most) and the OP never reported back what he saw in ACR which would be a useful test. 

I did see, for a split second, the poor preview from his DNG, then it updated and completely disappeared on this end, never came back. 

Why did the poor preview show up in the first place? No idea. Why his previews don't update correctly? No idea. 

While the originals are still disconnected you can export your example image as DNG in 9.4 and 10.0.

I wouldn't say that other thread solved anything.  It's a mess of bickering with no clear resolution.

What do you think? original smart previews? I do not understand. The problem is also solved here:

https://feedback.photoshop.com/conversations/lightroom-classic/horrible-noise-in-library-module/5f91ccdb6880ca65525984be?commentId=5f93288235f40c3a18c908bb

https://feedback.photoshop.com/conversations/lightroom-classic/lightroom-classic-image-previews-with-grain-are-very-very-very-bad/5f90576d35f40c2520b9ea58

I have the same problem.
In the library and in the develop module, the photo is terrible (as if too much grain).
I have a disconnected HDD disk (there are original photos on the disk).

I describe the problem here:

https://feedback.photoshop.com/conversations/lightroom-classic/poor-photo-in-the-library-and-develop-module-smart-previews/5f95f02a35f40c3a18c91af6?commentId=5f95f1aa72a09d5d5ced3a2a&replyId=5f96067c4833934b896f12d0

I have the same problem.
In the library and in the develop module, the photo is terrible (as if too much grain).
I have a disconnected HDD disk (there are original photos on the disk).

I describe the problem here:

https://feedback.photoshop.com/conversations/lightroom-classic/poor-photo-in-the-library-and-develop-module-smart-previews/5f95f02a35f40c3a18c91af6?commentId=5f95f1aa72a09d5d5ced3a2a&replyId=5f96067c4833934b896f12d0

But I agree OP should see if he can share the original smart preview.

Remember these aren't screenshots of a LR module, these are exports from LR using the smart preview.  Yes, they should match.

The differences are readily apparent from the images provided.  Let's see if this forum will show an animated GIF:

I'm on Safari, can zoom in from the View menu, still see no difference. But what the OP needs to do is either upload higher resolution screen captures (or links to the original) or ideally, show us each module at 1:1 otherwise no one should expect a match. 

I zoom in on a webpage in Safari with a 2-finger gesture on my touchpad.

if you don’t have a touchpad you can use Command-+ or any of the other options mentioned here:

https://www.cnet.com/news/zooming-options-for-safari-in-os-x/