Why does the migration ledger say V2 when the data update failed?

import {DatabaseSync} from 'node:sqlite';
import {TextDecoder} from 'node:util';
import {inflateSync} from 'node:zlib';
import {posix} from 'node:path';
import {createHash} from 'node:crypto';
const rows=(db,sql)=>db.prepare(sql).all().map(r=>({...r}));
const failed=(action)=>{try{action();return null;}catch(e){return {code:e.errcode??e.code??e.name};}};

import assert from 'node:assert/strict';
const run=function run(i,corrected=true){
    const db=new DatabaseSync(':memory:');try{db.exec("CREATE TABLE ledger(version TEXT);INSERT INTO ledger VALUES('V1');CREATE TABLE target(quantity INTEGER NOT NULL CHECK(quantity>0));INSERT INTO target VALUES(2);");
      if(!corrected)db.exec("UPDATE ledger SET version='V2';");db.exec('BEGIN;');
      const error=failed(()=>{db.prepare('UPDATE target SET quantity=?').run(i.nextQuantity);if(corrected)db.exec("UPDATE ledger SET version='V2';");db.exec('COMMIT;');});
      if(error)db.exec('ROLLBACK;');return {error,version:db.prepare('SELECT version FROM ledger').get().version,records:rows(db,'SELECT * FROM target')};
    }finally{db.close();}
  };
const cases=[{"label":"misleading base","input":{"nextQuantity":-1},"expected":{"error":{"code":275},"version":"V2","records":[{"quantity":2}]},"corrected":false},{"label":"corrected base","input":{"nextQuantity":-1},"expected":{"error":{"code":275},"version":"V1","records":[{"quantity":2}]},"corrected":true},{"label":"successful data and ledger commit","input":{"nextQuantity":4},"expected":{"error":null,"version":"V2","records":[{"quantity":4}]},"corrected":true},{"label":"required target value missing","input":{"nextQuantity":null},"expected":{"error":{"code":1299},"version":"V1","records":[{"quantity":2}]},"corrected":true}];
for(const test of cases){
  const actual=run(test.input,test.corrected);
  assert.deepEqual(actual,test.expected,test.label);
  console.log(test.label,actual);
}