The marker have a new data,but don't change a new location
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bug
- Dominant language
- Swift
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Description
## What did you do?
ℹ change new data,the marker don't change location,but change a new data;
## What did you expect to happen?
ℹ a location have a new data,the marker changed a new location
## What happened instead?
ℹ the marker don't change location;


## Charts Environment
**Charts version/Branch/Commit Number:3.0.4
**Xcode version:9.2
**Swift version:**
**Platform(s) running Charts:iOS
**macOS version running Xcode:10.12.6
=
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