Strange behaviour in the latest release of LR Classic 13.3 (Win). I've imported a shoot and used the embedded previews as I always do.
As I move through the filmstrip in develop every time I click on an image that still has the embedded preview icon showing LR is adding a new White Balance - As Shot to the history for the image. If I undo this step so the history is empty switch to another image and then back again LR doesn't add the WB setting again.
It seems it only happens to images using the embedded preview the first time they are opened in Develop.
It's very annoying as I can no longer use the unedited filter to see if there's any images in my final selection that haven't been edited.