Animals not spawning after adding grass to completely mobless superflat worlds.

Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt), otherwise we can not diagnose this issue.
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There was no crash so I don't have a crash report!

Yo, you put the description under Environment

What render distance were you using? If it's below 10, there's a good chance this is a duplicate of MC-2536.

Please check if that's still an issue in the latest 1.14 (pre-)release.

It seems to work fine in 1.14 pre-release 5

Thank you!