Fixing a problem with credit splitting as revealed by #1898 #1899
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We currently run into a situation where we would need to wait on futures before
actual serialization after the first round of awaiting has been completed. In
addition, the future itself doesn't give its held value the chance to be awaited.
This fixes the segfault on shutdown for the testcase provided by #1898 once all the remaining (user issues) has been fixed (this will come in a separate PR).