[Languages]
en, es, zh-CN

[Version number]
57.0.2987.110 (Official Build) (64-bit)

[OS details]
Linux (desktop), Clank

To reproduce:

1. Go to mail.qq.com
2. Select "Translate"
3. Select "Show Original"
4. Click on the translation icon in the omni-box and select "Translate"

At this point the translation usually never completes. 

This fails: es {translate} => en {show original} => es {translate} => en   << Hangs
This works: es {translate} => en {show original} => es {translate} => fr

I have tested translating from es and zh-CN. Both of these showed the issue. The issue is reproducible on both desktop and Android.

Some notes are here:
https://docs.google.com/document/d/1aNaAMerV3E8KxvuGxAqHzUEYBtb6mj7fcvixfiA1xBw