Atom - Julia: Completion with `Tab` suddenly stops working

I’m using Julia 1.0.3 on a macOS 10.14 and Atom 1.33.1.

I want to use unicode character such as ν or π

However after functioning properly for a few times, the completion with Tab stops functioning (e.g.: when I type \pi + Tab it doesn’t work although it worked for the previous ν and it doesn’t work either when I want to type a new ν).

Any idea?

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