X in Query Reply Time

Hi,
Quite simply really, I have looked and searched but could not see anything in the Docs.

In the Query Log, I have noticed lots of x in the Query Reply Time column from 1 IP (PC) only

What does the x signify?

Details about my system:

About 20 clients on my home network. Had a very old copy of PiHole installed from a few years back, so yesterday I upgraded to V6

Can you please post a screenshot showing the reply time column?

Also, what is shown in the REPLY fields?

(click on each row to open the details), like this:

This is expected when no reply is received:

Nothing was received, so there is no "reply time" to be shown:

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