Version

5.4.2

Link to Minimal Reproduction

See example in docs page: https://apache.github.io/echarts-handbook/en/how-to/chart-types/bar/stacked-bar/#

Steps to Reproduce

1. View the stacked bar in the docs
2. Reload the page so the transition animates

Current Behavior

1. There are gaps between the series as they animate in, each of the bar series "fills" up independently, meaning the transition looks odd

Expected Behavior

1. There are no gaps between the series as they animate in.

This could either be:

Option A. each series starts from zero thickness, at the x axis, and expands to its full extent, with the series also "moving up" as they go
Option B. the bar animates as a single unit, and the series are revealed as the animation progresses

I have tried to illustrate this below. Time is progressing left to right.

Environment

All, as far as I am aware!

Any additional comments?

It's possible this is "expected behaviour" and therefore a feature request not a bug. But it does look very strange.