Image size reporting as "thumbnail" after most recent update

[happy hooligans]

Recently, I noticed, when editing images in my existing blog posts, that the image size reported for all of the images on my blog is "thumbnail", when in fact, they were inserted into the post as "large" or "full". Is this a glitch that will be fixed? I hope so because there are old images in my blog, which were originally inserted incorrectly, and ARE in fact inserted as thumbnails. I correct these when I come across them in my editing, but now it's impossible to tell which ones are wrong because every image reports as being a "thumbnail image". Will this be corrected?

[happy hooligans]

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[noisysocks]

Hi @happy-hooligans. Do you know which version of WordPress made this start happening?