Why does Chrome have TTL -1000 in the DNS Cache?

I am working in a corporate environment, using Chrome. I am investigating some weird behavior, which may or may not turn out to be DNS-based.

If I navigate to:

chrome://net-internals/hostresolver#dns

I get the above image, which shows TTL values -1000.

What does this mean? I understand what a negative TTL usually means, but even for the non-expired row (which is a proxy, and is resolved) it has a value of -1000.

Anyone know how this works?

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