Torchlight

Six fixes, backed by a new runtime test suite (59 assertions on Paper 1.21.11 and 26.2): - Hand-placed light blocks are never modified or removed any more. - Two players on the same block: the light no longer goes out when one of them leaves; the brighter source wins. - No stale light left behind when a player has no free block around them. - Light under water (there was none) - water is restored when you move on, no air pockets. Flowing water is left alone. - The jar reports its real version in /plugins. No config changes needed.