When I lit on some trees near a sinkhole, watched spreading of fire, and when the trees were burning I entered into sinkhole then came back to ground after a few minute(3~4min), some trees in fire area were displayed as normal trees. But when I used axe on them, they disappeared with burnt tree axed animation and left charcoals behind.
Edit : When I turn off the app and restart and relog, it seems that displaying burnt tree problem is fixed. One normal tree near me has turned to burnt tree as it be.
As described in main text.