Saturation has no effect in speeding up regeneration when the hunger bar is at 20.
From the Minecraft Wiki, when the hunger bar reaches 20, remaining points of saturation be consumed will speed up the rate of natural regeneration to 1 heart per second. Unfortunately, this does not happen in the bedrock edition.
Comments 2
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Could you provide a video?