After playing 14w07a for about 20 minutes I noticed several warnings:
[Client thread/WARN]: Unable to play unknown soundEvent: minecraft:none
Related issues
duplicates
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migrated
MC-48842
Unable to play unknown soundEvent: minecraft:none
Resolved
Duplicate
0
migrated
migrated
(Unassigned)
Unconfirmed
Minecraft 14w07a
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Duplicate of MC-35619 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.