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ETe has a wip branch for this, see [here](https://github.com/etfdevs/ETe/issues/74)
It spams upon every other tab in 
`doit()` may solve the issue in this specific case, but you can run into the same problem when the antiderivative has a case distinction which can't be resolved without concrete...
Likely caused by `fs_game` variable corruption, needs further investigation 
 Print format seems to change for no apparent reason