Regarding the recent changes to bees they seem like are not taking pollen from tall flowers anymore, Bees can still pathfind sometimes to these flowers but they can't take the pollen, also seems like in most cases they pathfind only to the bottom meaning it's impossible for bees to reach the top of a sunflower where the pollen is suposed to be.
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The subtitles hints this behavior by confirming that bees can't gather the pollen from tall flowers
As you can see bees play the "Bee buzzes happily" sound and subtitle when they are getting pollen.
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With Tall Flowers
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Relates to MC-163054