As far as I can tell, all you need to do in order to reproduce this is call `diffusion.updatecoverage` for any given repository and you'll see this in your repository browser:
{F866494}
along with a fun javascript error
```
Uncaught Error: JX.$('UQ0_4') call matched no nodes.
JX.$E @ core.pkg.js:2
JX.$ @ core.pkg.js:276
(anonymous function) @ diffusion.pkg.js:8
JX.install.members._onload @ core.pkg.js:408
(anonymous function) @ core.pkg.js:69
JX.install.statics.pass @ core.pkg.js:147
JX.install.statics._dispatchProxy @ core.pkg.js:142
JX.install.statics.invoke @ core.pkg.js:89
proto.invoke @ core.pkg.js:67
JX.install.members._done @ core.pkg.js:226
(anonymous function) @ core.pkg.js:230
JX.install.members._handleResponse @ core.pkg.js:230
JX.install.members._onreadystatechange @ core.pkg.js:214
```
The API method does indeed successfully update coverage information correctly allowing you to see it inline when viewing files.
I realize it's an unstable API, serves me right, etc.