The bug
The debug pie chart diagram that shows by pressing Shift+F3 renders with two shadowed edges at the top and the bottom.
Before the 1.15 snapshots the shadowed edge were at the bottom only, with the purpose of making the chart look three dimensional.
Thank you for your report!
We're actually already tracking this issue in MC-164691, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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