Grouped bar chart leaves gaps when some traces have no values for an x-axis tick

I’m trying to create a grouped bar chart with multiple traces (e.g., 5). For certain x-axis ticks, not all traces have values. When a trace has no value for a tick, Plotly currently leaves an empty space in the group, which creates unwanted gaps in the bars. Additionally, when the last trace is missing, the bars can look not centered, which makes the chart visually misleading.

Proposed behavior:
If only 4 traces out of 5 have data for a given x-axis tick, Plotly should render just 4 bars side by side without reserving space for the missing trace. This would make grouped bars more compact and visually accurate.

Note that this is the same problem as in this closed issue that was never resolved: https://github.com/plotly/plotly.js/issues/930

复现一个包含五条轨迹的分组柱状图，其中一条或多条轨迹在选定的 x 轴刻度处缺少值，并将结果与已关闭 issue #930 中描述的行为进行比较。当缺失的轨迹不再预留空隙，且其余柱状条在每个组内仍保持视觉居中时，此更改即完成。