All my images are uploaded at 1280 × 800.
With Gutenberg I’ve been inserting them into posts as “large”, which according to WP image dimensions are sized at 1024 x 640.
When I was looking at some posts I did a few weeks ago, they are now labelled “thumbnail” instead of “large” and the size is either saying 1280 x 800 or 1024 x 640.
Any idea what might be causing this? They still seem to look all the same size, even though the say differently.
WP uses srcset to load images – it provides the URL to all the various thumbnail sizes and will select the one most suitable for the size it is being displayed at. So nothing to be concerned about.
I can’t explain why it would display the Full image when its set to Large.
The way the image block should work is if you select a particular size or manually resize the image then that is the maximum size it will be displayed at.
It will still use the closest srcset image to suit the needs – for example the large image may not be required on a smaller screen so it may select the medium srcset if it fills the space provided.