The `change_ref_state` parameter in `__wt_split_rewrite` (`src/btree/bt_split.c`) is always passed as `true` by both of its callers (`src/evict/evict_page.c:668` and `src/evict/evict_page.c:712`). The conditional at the end of the function:

if (change_ref_state)
    WT_REF_SET_STATE(ref, WT_REF_MEM);

is therefore always taken. The parameter should be removed and `WT_REF_SET_STATE(ref, WT_REF_MEM)` called unconditionally. The function comment, declaration in `src/include/extern.h`, and both call sites should be updated accordingly.