I tried to edit a question because it was tagged badly. It seemed mostly fine otherwise, though I decided to fix 2 punctuation and one capitalization errors (which would not normally warrant a suggested edit). However, The system told me

Oops! Your edit couldn't be submitted because:

• Edits must be at least 6 characters; is there something else to improve in this post?

My edit was more than six characters/changes if you include the tags I fixed. I think tag-edits with no body changes are also allowed, so I think this is a bug.