(Note: These three screenshots are lava blocks placed on the side, top, and bottom of the stem blocks.) I doubt this is my game being weird, but when placing a Crimson or Warped Stem in any dimension (this should work in any dimension) and placing lava do the side of the block, (it has to be in the air to do it and have no blocks surrounding it except for the one lava bucket source), the stem wont burn on fire. Despite the two blocks being flammable, which is obvious, this doesn't work with normal logs you only see in the Overworld Dimension (oak logs, acacia logs etc.), I tried in the air too, but the Overworld logs always seemed to burn, even if they were placed on the side. I also tried this with stripped logs, but the same thing happened. I also waited dozens of minutes for the Nether-only logs to burn, I could wait for hours if you didn't believe me and they still wouldn't burn. This is a pointless glitch/bug if you think about it, but I thought I should report it. (I think this only works if you do it on the side, I tried it on the top and bottom a few times and it didn't flame, the other times it did.)