Maybe I found a pattern: if minority get a bonus because of population support decreased, Torona's population vote details are missing, but if population support increased, details are present.
in order to reproduce:
start from savegame attached to this comment; next election is in 2 turns.
Test 1: do nothing for 2 turns: in 2 turns, after election, you'll find Torona's details in inbox
Test 2: dismantle all private assets in order to decrease population support; next turn (1 turn to election) you'll see population support dropping; next turn (election day) you'll miss the Torona's details in inbox.