[Bug] Calendar display doesn't fill card when Date Picker in M or Y

[bizbjc]

1. Is it related to Long Term Statistics (LTS)?

No

1a. If it is related to Long Term Statistics (LTS) then please attach your CSV file(s) of entities

I did

2. Your YAML Code

# Paste your yaml code here
type: custom:statistics-graph-chart-card
show_date_picker: true
date_picker_default_mode: month
group_by: date
chart_mode: calendar
entities:
  - entity: sensor.home_energy_usage
    number_format: dot
    aggregate_func: change
    graph_type: bar
    align_state: bottom-center
    show_trend_icon: false
    primary_state_as: sum
    name_position: below
annotations: []
grid_options:
  rows: auto
  columns: 12

3. Bug Description

When using a Calendar chart with Date Picker, the display of cells in "M" or "Y" mode do not utilise the full width of the card like "W" does.

[bizbjc]

Screenshots showing what is being rendered...