Check Wikipedia error number 64 says
A piped link has identical text before and after the pipe. AWB and AutoEd can usually fix these. MediaWiki displays [[link|link]] as [[link]].
Most of the time (on the Hungarian Wikipedia), it is caused by the Visual Editor when a user edit a link (it can also make other problems, see T56947). I think VE could solve this problem if it would check and fix these links before saving.
The problem is not that serious to we should run a bot just for fixing these links, but VE itself could solve it easily and should prevent their births.