Despite the resolving of MCPE-188870, the world still suffers from less grass and flower generation compared to Java Edition even after the changes made in the 1.21.60.27 Preview (though I'm still not sure why MCPE-188870 was closed considering the fact that 1.21.60.27 did not address any of the issues with grass and flower generation). 

Steps to reproduce:

• Launch Minecraft Preview (1.21.60.27+)
• Create a new world in creative mode
• Navigate to a Plains, Savannah, or Flower Forest biome
• Observe your surroundings

Expected Result:

Like Java Edition, both tall and short grass are significantly more present and generate frequently in large clumps. Flowers are more prevalent in all biomes known for having a lot of Flowers.

Observed result:

Grass and flower generation is still exactly the same as it was in 1.21.60.23 and the experimental changes introduced in 1.21.60.25 make no difference. Like I mentioned previously in MCPE-188870 most foliage generation (besides Kelp and Seagrass) is unlike Java edition. In summary:

• There is significantly less of both tall and short grass. On Bedrock both grass types generate very spread apart.
• Flowers are less common in many flower-bearing biomes.

Notes:

This is a new report containing the unfixed issues found in MCPE-188870 (thanks again to AgentMindStorm2) and is not meant to be a duplicate of MCPE-141364. Like I also mentioned in MCPE-188870, while foliage generation is better, it still needs some fine tuning. Again, I implore the team to please give foliage generation some more tweaks over the next couple of Previews similar to how we've received improvements to the generation of Kelp and Seagrass in the 1.21.60.27 Preview.

The team should preferably draw inspiration from version 0.9.0 of Pocket Edition (as highlighted by LumiQuest at MCPE-141364) in regards to grass generation because it more closely matches modern day Java's grass generation compared to the generation present in 1.21.60.23 or 1.21.60.27: