Hello,
the bot adds duplicate{{ to wikicode. [http://domain.org/link.html Something]{{dead link}} can be transferred to something like [http://archive.org/web/timestamp/http://domain.org/link.html Something]{{ incorrectly. See https://cs.wikipedia.org/w/index.php?title=MIR&diff=prev&oldid=16284909 as one example. See in comments for another examples.
Thank you for fixing,
Martin Urbanec
https://cs.wikipedia.org/w/index.php?title=Metro_v_Moskv%C4%9B&diff=16284938&oldid=16161871, https://cs.wikipedia.org/w/index.php?title=Bohuslav_Sobotka&diff=16284952&oldid=16167627, https://cs.wikipedia.org/w/index.php?title=Karlova_Stud%C3%A1nka&diff=16284928&oldid=16147066, https://cs.wikipedia.org/w/index.php?title=Seznam_%C5%BEelezni%C4%8Dn%C3%ADch_stanic_v_%C4%8Cesku&diff=16284975&oldid=16263315, after my jobs will complete https://cs.wikipedia.org/w/index.php?search=insource%3A%2F%5C%7B%5C%7B+%5C%7B%5C%7B%2F&title=Speci%C3%A1ln%C3%AD:Hled%C3%A1n%C3%AD&profile=default&fulltext=1&searchToken=2mbueldob74ne1ynwsphuthuu will throw probably more results.
The bug is present in another form as well, see https://cs.wikipedia.org/w/index.php?title=Jevgenija_Kolodkov%C3%A1&diff=prev&oldid=16285195 or https://cs.wikipedia.org/w/index.php?title=Seznam_kulturn%C3%ADch_pam%C3%A1tek_v_okrese_Brno-venkov&diff=prev&oldid=16285192 or others on https://cs.wikipedia.org/w/index.php?search=insource%3A%2F%5C%7D%5C%7D%5C%7B%5C%7B%5C%3C%5C%2Fref%5C%3E%2F&title=Speci%C3%A1ln%C3%AD:Hled%C3%A1n%C3%AD&profile=default&fulltext=1&searchToken=7ai0e58kbxty025ixnwnu2srb (if I/somebody else won't fix them :)).