- Open https://test.wikipedia.org/wiki/Template
- Tap the edit pencil on the first section
- Replace the spaces between name and = and cover and = with spaces entered by the iOS keyboard
- Submit the edit
Resulting article has a functioning template
Resulting article has a broken template
This edit and this edit (the | victims = parameter), both tagged as "ios app edit", changed regular spaces to non-breaking spaces (NBSP) in similar patterns within template parameter assignments. This breaks the parameter assignments, in this case causing the corresponding items in the infobox to not be displayed, but it can break templates more severely.
These character substitutions, with the pattern of alternating regular spaces and NBSPs, look unlikely to be caused by the person making the edit.
Steps to reproduce
I don't have an iOS device, so I can't reproduce such an edit.
Editing should not cause spaces to be changed to NBSPs in template parameter assignments.
Spaces were changed to NBSPs in template parameter assignments.
Page revision history, edits with "ios app edit" tags