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Your screen shot showed the product name hasn't change yet too.

Yes it's not changing

special characters are not allowed as the title? Yes I guess.

Btw, check here no dot Screenshot_20180930-090226.png

If you think this is a bug, could you take a record of the screen (the part you edit and submit) and report via #bud-report channel?

Successfully changed 💯.
Not a bug.