See below:
```
[subbu@earth:~/work/wmf/parsoid] echo -e " foo\n[[Category:Bar]]" | parse.js --body_only
[warn/dsr/inconsistent][enwiki/Main Page] DSR inconsistency: cs/s mismatch for node: PRE s: 1 ; cs: 0
<pre data-parsoid='{"dsr":[0,21,1,0]}'>foo
<link rel="mw:PageProp/Category" href="./Category:Bar" data-parsoid='{"stx":"simple","a":{"href":"./Category:Bar"},"sa":{"href":"Category:Bar"},"dsr":[5,21,null,null]}'/></pre>
[subbu@earth:~/work/wmf/parsoid] echo -e " foo\n[[Category:Bar]]" | parse.js --wt2wt
[warn/dsr/inconsistent][enwiki/Main Page] DSR inconsistency: cs/s mismatch for node: PRE s: 1 ; cs: 0
foo
[[Category:Bar]]
```
This bug has probably been there since start-of-Parsoid-time. It is just that is rarely, if ever, encountered because of selective serialization. Because of T225217, since we are now running full normalizing serialization, this bug got exposed.
==Original bug description:==
See the following edits (sorry about them being on a staff-only wiki, posting screenshots too):
- https://office.wikimedia.org/w/index.php?diff=next&oldid=252780
- https://office.wikimedia.org/w/index.php?diff=next&oldid=252857
- https://office.wikimedia.org/w/index.php?diff=next&oldid=252865
These edits were all made with VE, and each of them added another space to the start of the line containing `[[Category:Humor]]` at the bottom, as well as to the whitespace-only line before it.
{F29462081}
{F29462084}
{F29462086}
It looks like the first space on this line originated from a big whitespace normalization edit made by VE earlier: https://office.wikimedia.org/w/index.php?diff=prev&oldid=252444