signrawtransactionwithwallet seems to break the existing signatures of some of the inputs

It seems that this rpc alters the scriptSig of all of the inputs that were already signed (second and third vins in this case), except for the first one.
This is an example with 4 inputs, where the first 3 are transactions that are already signed:

Before executing signrawtransactionwithwallet, I have this transaction:
```
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
```
and after executing it, I get this one:
```
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
```

By decoding both, it seems that this RPC alters the scriptSig of all of the inputs that were already signed, except for the first one.

The error that is returned by the RPC on the inputs that were already signed (second and third vins in this case) is:
"Unable to sign input, invalid stack size (possibly missing key)"