API Regions Remove not deleting regions

C3 version: v0.7.20
D3 version: v5.16.0
Browser: Firefox 82.0.2 64 bit
OS: Win10

in: api.region.ts function: Chart.prototype.regions.remove = function (options) {.........

the code snipit

  config.regions = config.regions.filter(function (region) {
      var found = false;
      if (!region['class']) {
          return true;
      }
      region['class'].split(' ').forEach(function (c) {
          if (classes.indexOf(c) >= 0) {
              found = true;
          }
      });
      return !found;
  });

does not remove the regions from config.regions because the filter function always returns true.

in my opinion the code should be:

  config.regions = config.regions.filter(function (region) {
      if (!region['class']) {
          return true;
      }
      region['class'].split(' ').forEach(function (c) {
          if (classes.indexOf(c) >= 0) {
              found = true;
          }
      });
      return false;
  });

ie the filter function should return false to remove the region

c3js / c3

API Regions Remove not deleting regions #2819