In creative mode, you cannot pick up (obtain) water/lava/powder snow bucket using an empty bucket. This is fixed in the pre-releases of Java 1.16.
Steps to Reproduce:
1. Create a creative world
2. Find a lava/water pool
3. Use the empty bucket to get the bucket of water/lava
Observed Results:
It doesn't give you a bucket of water/lava/powder snow, but you can still interact with the pool with an empty bucket.
Expected Results:
Bucket of water/lava/powder snow is in the inventory.
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affects 1.16.210

affects 1.17.20.22

you also cannot get buckets of powder snow when using buckets on powder snow blocks in Creative mode

I can confirm that i tried it

Confirmed in 1.21.44
On java this change now also was made to milking cows and mooshroom. So you now only get the milk, mooshroom soup or suspicious stew if you don't have one in your inventory.