It is rather seldom to get paragraphs or segments with line spacing before the paragraph inside CT segments.
Nevertheless, this is what happended to me:
The line spacing (before the paragraph) that is reflected in the grid is not there in the source segment editor. As the project contains a whole bunch of carriage returns inside the segments, this is even more irritating.
Indeed this is a complicated format: a Studio project with a json file inside that has HTML entities and carriage returns (that are not segmented in Studio, no idea how this is possible).
But this line spacing before the paragraph should not be reflected in the grid, should it?
If CT would get rid of those returns, you might not be able to open the file in the original tool that created the file. It depends on that tool how it interprets them.
This in combination with "Hide boundary tags".
The grid should show new lines, which is especially useful when one works in the Paper or Clipboard workflow.