Steps to reproduce:
- Visit https://en.wikivoyage.org/wiki/Special:MapSources/1,0,scale=100000
- type 2,0,scale=100000 into the form field and submit
Expected outcome: /wiki/Special:MapSources?params=2%2C0%2Cscale%3D100000
Actual outcome: /wiki/Special:MapSources/1,0,scale%3D100000?params=2%2C0%2Cscale%3D100000