Not entirely sure this is a bug (I can't remember if this was ever possible), but in the current build as well as the beta build, ransacking a tile or having your own tile ransacked doesn't generate any grievances. The exception to this is if trade routes happen to run through it, but that's not always the case. 

Reproduce:

Wait for a rival player to complete a ransack against any district (most likely an outpost or harbor).

No grievance is given for the action

Expected:

When rival player ransacks a district, a grievance should be given against them.