When picking up lava with a bucket and quickly placing it on a neighbouring lava source, it completely dissappears. Also, the bucket has a 'cooldown' when trying to quickly pick up a neighbouring lava source and forces you to double click to obtain the lava bucket (works fine with sources not connected. I assume the same thing might happen with water but haven't tested it.
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We've determined this issue is actually the same as MCPE-43960, so I am resolving this ticket as duplicate.