Fastcount isn't adjusted correctly when transaction started and prepared is entirely rolled back

python buildscripts/resmoke.py --suites=no_server repro_server40517.js repro_server40517.js ( function () { "use strict" ;   load( "jstests/core/txns/libs/prepare_helpers.js" ); load( "jstests/replsets/libs/rollback_test.js" );   const rollbackTest = new RollbackTest(); const rollbackNode = rollbackTest.getPrimary();   // The makeDocs() function makes it easier to have transactions insert varying numbers of // documents in order to keep all possible sums of count adjustments as distinct values. let nextId = 0; const makeDocs = (numDocs) => { return Array.from({length: numDocs}, () => ({_id: ++nextId})); };   const testDB = rollbackNode.getDB( "test" ); assert.commandWorked(testDB.mycoll.insert(makeDocs(2)));   rollbackTest.transitionToRollbackOperations();   // We perform some operations on the "test.mycoll" collection aside from starting and preparing // a transaction in order to cause the count diff computed by replication to be non-zero. assert.commandWorked(testDB.mycoll.insert(makeDocs(5)));   const session = rollbackNode.startSession({causalConsistency: false }); const sessionDB = session.getDatabase(testDB.getName());   session.startTransaction(); assert.commandWorked(sessionDB.mycoll.insert(makeDocs(10))); PrepareHelpers.prepareTransaction(session);   rollbackTest.transitionToSyncSourceOperationsBeforeRollback();   // XXX: Workaround for SERVER-40322. assert.commandWorked(rollbackNode.adminCommand( {setParameter: 1, createRollbackDataFiles: false }));   rollbackTest.transitionToSyncSourceOperationsDuringRollback(); rollbackTest.transitionToSteadyStateOperations();   rollbackTest.stop(); })();