Can confirm for 1.18. pre-1. I hope this especially gets fixed for Spore Blossoms soon, it's a bit silly bees can't pollinate on the giant pollen-spreading flower
Here's a code analysis along with a potential fix regarding this issue. The following is based on a decompiled version of Minecraft 1.18.1 using MCP-Reborn. 🙂
If we look at the above class, we can see that spore blossoms and chorus flowers aren't included within the BEE_GROWABLES block tag, meaning that bees cannot pollinate themselves with these blocks.
Potential Fix:
Simply adding Blocks.SPORE_BLOSSOM and Blocks.CHORUS_FLOWER to this block tag should resolve this problem. The correct lines of code within their class should look something like the following:
Relates to MC-168267