multiFile with timeout param, randomly delelte log files

[tjpgt]

from: #1352

code:

const log4js = require('log4js');

const extension = '.log';
log4js.configure({
  appenders: {
    multi: {
      type: 'multiFile', base: '.', property: 'categoryName', extension,
      maxLogSize: 60, timeout: 1000,
      layout: { type: 'messagePassThrough' }
    }
  },
  categories: {
    default: { appenders: ['multi'], level: 'debug' }
  }
});

const logger=log4js.getLogger('test');
setInterval(()=>{
    logger.log(new Date())
},1000)

log4js version: 6.7.1

Using my code above, after a while, I expect it should generate 5 or 6 log file. For example, test.log, test.log.1, test.log.2 ... test.log.5. But what actually happens is, it randomly deletes the log file, only keeps the test.log, test.log.1(and maybe some other files).

like:

[Janaki4]

Hey , Is this issue still open ?

[tjpgt]

Hey , Is this issue still open ?

Yes， the problem still exists.