xhr-upload retry upload bundle throws "error uncaught in promise"

[BePo65]

I'm using uppy 1.6.0 in an angular 8 project. To upload to my server I use the xhr plugin together with uppy-dashboard.
The Upload uses "bundle=true".
When the server returns an error everything runs fine and the dashboard shows the "retry" button.
But when the server stil returns an error on retry, I get an "error uncaught in promise" message in the browser console. This effect is independant of angular as can be seen on my sandbox example (https://codesandbox.io/s/blue-cache-gzqbl).

I tried to find out if / where a catch is missing but got lost in the nested then / catch.
in "_runUpload" the line "this.emit('error', err, uploadID)" gets executed, but then the uncaught error strikes,

Without "bundle=true" all runs fine.

Any help appreciated :-)

[stale]

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