Hmm, very strange!
- Does it only occur with words at the end of documents as in your two videos, or does it occur in other places as well?
- Is the content that gets pasted always in your document somewhere else?
- Does it occur on short documents, with a paragraph and then the spelling error? Do you find it happens more on long or short documents?
- Does it occur when “Display entire document at once” is checked? This is a setting in Preferences > Accessibility that controls the display of offscreen content