When embedding a Base file into Page A, logically, the preview should only be triggered when hovering the cursor over the link in the first column. However, as shown in picture below, the preview will be activated whenever the cursor hovers over any other area of the embedded table. Moreover, the preview displays the content of the current view. Since the content of this view is already embedded and visible on the page, what is the point of showing the preview? This issue persists consistently whether using the Hover Editor plugin or the native core page preview plugin.
I’ve never had that happen. Does it happen when you turn on Settings > Community plugins > Restricted mode? If yes, then also try with the default theme and all CSS snippets disabled.
If it still happens, then what are your Page preview settings and your debug info (from Command palette > Show debug info)?