I can't add any biomes and features with addon even if I use same seed and same addon(same json).
In 1.16.40, they can be added but in beta, they can't.
Of course I made sure "creation of custom biomes" is 'true'.
If it is not a bug, please tell me in detail what's changed about adding biomes and features by recent update to beta.
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Thank you for your report!
We're tracking this issue in MCPE-100700, so this ticket is being resolved and linked as a duplicate.
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He means that biomes and features don't show up in any world