andrus opened a new issue, #21520:
URL: https://github.com/apache/echarts/issues/21520
### Version
6.0.0
### Link to Minimal Reproduction
option code provided in the body
### Steps to Reproduce
The following option properly renders as a map of Iceland with a numeric
dataset displayed on mouse over each region:
```javascript
var opt = {
tooltip: {
trigger: 'item',
},
dataset: {
source: [
['L0', 'val'],
['Austurland', 1000],
['Suðurland', 256],
['Norðurland vestra', 489],
['Norðurland eystra', 51]
]
},
geo: {
map: 'iceland',
aspectScale: 0.42261826174069944,
label: {
show: true,
position: 'inside'
}
},
series: [
{
name: 'val',
encode: {
value: 1,
itemName: 0,
},
seriesLayoutBy: 'column',
coordinateSystem: 'geo',
geoIndex: 0,
type: 'map'
},
]
}
```
Same option, but changing the dataset layout to row-based and setting
`seriesLayoutBy: 'row'` results in an error shown in the next section.
```javascript
var opt = {
tooltip: {
trigger: 'item',
},
dataset: {
source: [
['L0','Austurland','Suðurland','Norðurland vestra','Norðurland
eystra'],
['val',1000,256,489,51]
]
},
geo: {
map: 'iceland',
aspectScale: 0.42261826174069944,
label: {
show: true,
position: 'inside'
}
},
series: [
{
name: 'val',
encode: {
value: 1,
itemName: 0,
},
seriesLayoutBy: 'row',
coordinateSystem: 'geo',
geoIndex: 0,
type: 'map'
},
]
}
```
### Current Behavior
This error for the "row" layout
<img width="1237" height="422" alt="Image"
src="https://github.com/user-attachments/assets/55c1b8f1-dac2-40cc-b801-84345848f29e";
/>
### Expected Behavior
No error should be thrown, the map of Iceland should display, mouse over the
country regions should display dataset numbers.
### Environment
```markdown
- OS: MacOS
- Browser: agnostic, e.g., Firefox 148 or Chrome 145.0.7632.117
- Framework: N/A
```
### Any additional comments?
_No response_
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