False negative: phrasal verbs written as compound nouns not flagged after "then"

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I can't think of instances where fixing this the obvious way could lead to false positives, but I'll do some hunting...

Start by reproducing the reported false negative involving phrasal verbs written as compound nouns after “then,” using the linked image as the only example provided. Inspect the relevant grammar-checking behavior and look for existing coverage of this wording. Done means the intended construction is flagged without introducing false positives.

Written by the indexing model from the issue text.