Inside clayered_enter and clayered_leave we increase and decrease session->ncursors. We need to re-evaluate whether this is okay and need at all.

We also have a strange if condition for the __wt_txn_read_committed_should_release_snapshot function that cause cursors to be reset. 

That's probably because of this code from the file cursor:

/*
 * When the count of active cursors in the session goes to zero, there are no active cursors, and we can release any snapshot we're
 * holding for read committed isolation.
 */
 if (session->ncursors == 0 && !WT_READING_CHECKPOINT(session))
     __wt_txn_read_last(session);

• https://github.com/wiredtiger/wiredtiger/blob/develop/src/include/cursor_inline.h#L274-L279

We should check whether we can simply remove the condition for __wt_txn_read_committed_should_release_snapshot together with the function.