What happened?

When running this with a mod like leaves-us-in-peace, the various trees generated by promenade have most of their leaves decay immediately upon spawn.

Dawn API version

3.3.0

Fabric API version

0.51.1+1.18.2

Relevant log output

No response

What trees specifically did you see decay?

https://www.dropbox.com/s/cciusyaik2t2ex2/Screen%20Recording%202022-05-10%20at%2017.48.42.mov?dl=0

Here's a screen recording I took. The particles you see spawning come from the affected trees. In this example, I'm passing over a dark oak forest and a jungle. I don't know the exact names of the trees.

Good point, those trees seem to be from biome-makeover. However, I'm seeing the same behavior with the cherry oak trees in promenade.

Promenade does not add any leaves blocks in jungle or dark oak forests biomes... are you sure this is coming from my mod? If yes, why?

Looks like Leaves Us In Peace does not support other modded blocks initially.
I have done research and found out that you can indeed bring compatibility via datapacks (and yourself if you need to). I'm not sure yet I would like to include native compatibility within Promenade, as this is rather a uncooperative solution for the purpose of the mod. If you want native compatibilty, you may want to ask the mod author instead.