Savannah villages now use acacia wood more than before, including in blacksmith shops. The lava source blocks in these structures used to be surrounded by cobblestone, but are now surrounded by acacia wood which will catch fire. Usually this results in the entire building burning to the ground, allowing the lava to spill out and destroy other buildings. This has happened in every single savannah village I have seen in this snapshot so far (about 4 or 5). This might not technically count as a "bug", but it definitely seems like something that needs to be fixed.

I've included lots of screenshots because the progression is kinda fun to watch.