Commenting out a whole line deletes the line below it

I don’t know when or why this anti-feature was added, but before, when I selected a line and commented it out, it wouldn’t affect the line below it.

Repro:

  1. Select a line by clicking on it three times (to select the newline character at the end)
  2. Comment out the line and you’ve deleted the line below it

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This only happens when I select the newline character at the end of the line.