I had a map in my base and accidentally popped one off this morning. When I looked at it, it had become mostly gray but showed a few other random things. I made new maps of the area and the same thing is happening.
The world was created in 18w14b and has been upgraded up to 18w20c.
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My apologies for the duplicate. I searched but didn't see that one.

All good. You probably were only searching for unresolved tickets, which is the default.