There is a bug reported a year ago that is addressing the problem with the decimal marker.https://www.drupal.org/project/drupal/issues/2735997
When setting decimal marker to ',' before grouping it works as aspected, but when grouping the view this fall back to '.'
Before grouping, there are settings available for Thousand marker, Decimal marker and Scale. All working fine until you hit the grouping checkbox.
After grouping, only setting for Thousand marker is available. This is not so logical. The best is, of course, that the bug is resolved. But it seems to be far away. So why not add all three settings, there are available before grouping: Thousand marker, Decimal marker and Scale. This should also be a work around for the problem with Twig number format. Twig number format is also collapsing when a view display is grouped. You can not use Twig round or Twig format functions when the checkbox Grouping is checked.

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chrotto created an issue. See original summary.

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