Why is the WYSIWYG editor breaking the source in this release? Tell it to leave it alone.

links that look like this: anch1 when getting saved via the WYSIWYG view is turning into this [anch1]

Steps to reproduce:
Create a new page

Paste in this in the wiki markup view:
anch1
anch2

save.

edit the page.

switch to the Rich Text editor

save

now the links are broken.