Image does not call onLoad when initialized from base64 inline data

[mtalley]

Environment

1. react-native -v:

react-native-cli: 2.0.1
react-native: 0.60.6

2. react-native run-windows --info:

System:
OS: Windows 10 10.0.18363
CPU: (8) x64 Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
Memory: 16.44 GB / 31.94 GB
Binaries:
Node: 10.15.0 - C:\Program Files\nodejs\node.EXE
Yarn: 1.13.0 - C:\Program Files\nodejs\yarn.CMD
npm: 6.4.1 - C:\Program Files\nodejs\npm.CMD
npmPackages:
react: 16.8.6 => 16.8.6
react-native: 0.60.6 => 0.60.6
react-native-windows: 0.60.0-vnext.155 => 0.60.0-vnext.155
Installed UWP SDKs:
10.0.16299.0
10.0.17763.0
10.0.18362.0

• Target Platform Version(s):
  10.0.18362.0

• Target Device(s):
  Desktop

• Visual Studio Version:
  Visual Studio 2017

Steps to Reproduce

1. Initialize an Image component with an inline data source (using the data: uri scheme)
2. Set an onLoad callback
3. Run

Expected Behavior

onLoad is called when the image finishes loading the data stream

Actual Behavior

onLoad is never called (whereas it does get called for images loaded from a "normal" URI)

Reproducible Demo

https://snack.expo.io/@mtalley/imageloadcallbacks

[chrisglein]

@marlenecota Are there any known issues here with inline data? I know that's pretty recent. In fact, this was reported on 60... is there maybe payload in 61 that could fix this?

[chrisglein]

Not something we plan to address on the Paper renderer as we move towards Fabric.
Fabric API completion for Image tracked here: #11144
Fabric will not use XAML for the fundamentals here, so this isn't necessarily applicable.