Attached video should explain better. All versions of Amethyst buds will float when placed on an extended piston with a block in front of it and then retract piston. They do not float if the block is on the sides of Amethyst
Edit: They can fully float if the block it is facing is broken. Doesn't matter which direction either
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We're tracking this issue in MCPE-126076, so this ticket is being resolved and linked as a duplicate.
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