This bug was brought up and apparently fixed almost 8 years ago. However, it was brought up on PPCG.meta that the problem is back.
Basically, the problem is that multiple spaces in code markdown are not shown in comments. For example, the following:
`...<space><space><space>...`
in a comment will be rendered as
... ...
I have tested this in the sandbox, and it seems it only shows one space regardless of how many I enter.