Did some stepping and blackboxing, then boom: https://www.loom.com/share/16d169cda92a4fddb5bb8cce3e741d1c (mumbling and light explicit language)

STR is that I pretty-printed a SOURCE file.

Error: "Resource source-server0.conn1.child2/source15490/originalSource-21eb1fc094f510399f0fb9e6f2c15d92 does not exist"
    getMappedResource resource://devtools/client/debugger/src/utils/resource/selector.js:37
    getSourceWithContent resource://devtools/client/debugger/src/reducers/sources.js:680
    mapStateToProps resource://devtools/client/debugger/src/components/Editor/DebugLine.js:141
    Redux 13
    waitUntilService resource://devtools/client/debugger/src/actions/utils/middleware/wait-service.js:71
    promiseMiddleware resource://devtools/client/debugger/src/actions/utils/middleware/promise.js:46
    context resource://devtools/client/debugger/src/actions/utils/middleware/context.js:35
    thunk resource://devtools/client/debugger/src/actions/utils/middleware/thunk.js:29
    dispatch Redux
    mapFrames resource://devtools/client/debugger/src/actions/pause/mapFrames.js:150
react-dom.js:12769:13

The severity field is not set for this bug.
:jlast, could you have a look please?

For more information, please visit auto_nag documentation.

This as this resource layer has been removed so this is invalid.