1)When using bone meal on poppy or dandelion, the flowers will appear, but if trying to harvest, approximately half will disappear upon trying to `break` as if they never existed.
2)Using bone meal on one of those 'non-existent' flowers, the flower that was the target will disappear, even though new flowers will appear on surrounding blocks.
To recreate 1, use bone meal on a poppy or dandelion. Try to break any of the new flowers that are created. Some will drop the appropriate flower, some will disappear.
To recreate 2, after using bone meal on a poppy or dandelion, use bone meal on one of the newly created flowers. Some of the new flowers will disappear when bone meal is used on them.