NASM/Yasm drops CALL after comment ending with backslash

Question

I am currently trying to built my own boot loader and noticed something peculiar.

When below code is assembled with NASM or Yasm without the marked NOP command the follo

Answer 1

The backslash character, '\', as the last thing on a line, is Nasm's "line continuation character". By putting it in a comment, the comment is continued to the next line - commenting out the nop or call. (it is not the nature of nop to just disappear like that!). Lose it, or put something after it.

– Frank Kotler

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From the NASM manual, 3.1 Layout of a NASM Source Line:

NASM uses backslash (\) as the line continuation character; if a line ends with backslash, the next line is considered to be a part of the backslash-ended line.