I’ve just found a bug with combination of embedded comments and sub-folder installation:
‘Continue Discussion’ button and user links does not respect subfolder path.
But ‘Start Discussion’ button does respect subfolder path.
So I can only post once on embedded thread.
Here is the example: http://nsr24.com/football/game/705041
Discourse installed into: http://nsr24.com/social/en/
‘Start Discussion’ url is http://nsr24.com/social/en/t/bournemouth-west-ham-united-new-sports-rating/13
’Continue Discussion’ url is just /t/bournemouth-west-ham-united-new-sports-rating/13
Discourse Version v1.5.0.beta8 +11 (Docker + subfolder official guide)