Lc0 can't reuse the tree after castling moves

[SashaMN]

Using the latest version from next branch lc0 client on ubuntu 16.04 with cudnn on 5 gpus.
It looks like lc0 always drops the tree after every castling move. I observe this problem every game. Here is one log example.
Launch command:

./engines/lc0_new --slowmover=2.8 --tempdecay-moves=5 --threads=20 --weights=engines/weights_kb1-256x20-2100000.txt --cpuct=3.16836 --fpu-reduction=-0.0683163 --backend=multiplexing --nncache=20000000 "--backend-opts=a(backend=cudnn,gpu=0,max_batch=512),b(backend=cudnn,gpu=1,max_batch=512),c(backend=cudnn,gpu=2,max_batch=512),d(backend=cudnn,gpu=3,max_batch=512),e(backend=cudnn,gpu=4,max_batch=512)"

game_log.txt

[mooskagh]

This issue was moved to LeelaChessZero/lc0#16