fix(groups): missing dot path step

Also sync assignments on unassign as well as assign

website/server/libs/user/index.js

@@ -237,7 +237,7 @@ export async function update (req, res, { isV3 = false }) {
         user.flags.lastNewStuffRead = lastNewsPost._id;
       }
     } else if (key === 'preferences.tasks.mirrorGroupTasks') {
-      user.preferences.mirrorGroupTasks = _.intersection(groupsToMirror, matchingGroupsArray);
+      user.preferences.tasks.mirrorGroupTasks = _.intersection(groupsToMirror, matchingGroupsArray);
     } else if (acceptablePUTPaths[key]) {
       let adjustedVal = val;
       if (key === 'stats.lvl' && val > common.constants.MAX_LEVEL_HARD_CAP) {

website/server/models/group.js

@@ -1475,8 +1475,7 @@ schema.methods.unlinkTask = async function groupUnlinkTask (
   };
 
   delete unlinkingTask.group.assignedUsersDetail[user._id];
-  const assignedUserIndex = unlinkingTask.group.assignedUsers.indexOf(user._id);
-  unlinkingTask.group.assignedUsers.splice(assignedUserIndex, 1);
+  unlinkingTask.group.assignedUsers = _.keys(unlinkingTask.group.assignedUsersDetail);
   unlinkingTask.markModified('group');
 
   const promises = [unlinkingTask.save()];