[MC-171111] Nether generates trees above top level Bedrock

I did a quick search couldnt find related post. Added some screenshots.

Seed: -5580466666767544019

X/Y : 746/650

(nether ofcourse)

Environment

Win 10.
Java 8 151 (and Java 8 151 64bit)

Thank you for your report!
We're actually already tracking this issue in MC-170823, 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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