100pah commented on PR #21201:
URL: https://github.com/apache/echarts/pull/21201#issuecomment-3342603444
Before this issue is thoroughly resolved, an workaround can be used:
```js
// --- Bad (May be unexpected) ---
const chart1 = echarts.init(mainDOMElement);
chart1.setOption(option1);
chart1.setOption(option2); // call `setOption` in "merge mode"
chart1.setOption(option3);
chart1.setTheme('dark');
// After calling `setTheme`, the previous options (option1 and option2) are
discarded. Only the last option (option3) is retained.
// --- Solution ---
const chart1 = echarts.init(mainDOMElement);
// Make sure every option contains all the information and using `notMerge
mode` in `setOption`.
chart1.setOption(option1, {notMerge: true});
chart1.setOption(option2, {notMerge: true});
chart1.setOption(option3, {notMerge: true});
chart1.setTheme('dark');
// The previous options (option1 and option2) are also discarded. But the
last option (option3) contains all the information and retained, so the finall
effect is correct.
```
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