Minecraft wiki entry for Development_versions, associated text: MC-241191 – Tripwires occasionally have incorrect block states after upgrading old worlds.
MC-241194 – Crash: java.lang.NullPointerException: Cannot invoke "ddm.a(cao, cps, java.util.Random, gh)" because the return value of "java.util.function.Supplier.get()" is null.
MC-241199 – Double chests have incorrect block states after upgrading old worlds.
MC-241204 – Specific chunks reset each time world is loaded.
MC-241208 – Powered buttons, pressure plates, and tripwire hooks remain powered forever after upgrading old worlds.
MC-241231 – Floating campfire in a village.
MC-241234 – Fossils get cut off at chunk borders.
MC-241413 – Floating water generates around ravines.