If you zoom in to 3:1 zoom then you are magnifying the image by 3-times so every image pixel is displayed with a 3x3 array of display pixels. When you zoom in you want to see how noise-reduction and sharpening are affecting individual pixels and the only way to show this is to resize the pixels larger than the display pixels without smoothing the edges so you can see individual pixel boundaries.
Here is what a picture of flowers looks like at 3:1 on my LR5.6 and if you click on it to view at full-resolution you'll also see individual pixel boundaries:
What reason do you have that you shouldn't be seeing individual pixel boundaries when zooming in at a higher magnification of 1:1?
When I zoomed in on pictures about 2 weeks ago, the picture may have gotten blurry, but not pixelated and blocky like this. My image quality is up into the 5000 range. I don't see why it should be blocky on 3:1
Then it was not working last week and is working this week or there is some other confusion about what is or isn't the same between last week and this week.
As I said the individual image pixels are being enlarged without smoothing so you can judge what the noise-reduction and sharpening are doing to the individual pixels.
If you view images in an operating-system viewer outside of LR, then it may smooth pixels if you zoom in more than 100%.
Are you confusing 1:3 and 3:1? What would you expect 11:1 (11x magnification) to look like?
My image quality is up into the 5000 range.
Can you please explain what you mean by this. I am not familiar with this method of denoting image quality