dayjs('2020-12', 'YYYY-ww').format('YYYY-ww') not equal to '2020-12'

**Describe the bug**
```
import advancedFormat from 'dayjs/plugin/advancedFormat';
import isoWeeksInYear from 'dayjs/plugin/isoWeeksInYear';
import customParseFormat from 'dayjs/plugin/customParseFormat';
import weekYear from 'dayjs/plugin/weekYear';
import weekOfYear from 'dayjs/plugin/weekOfYear';
import isoWeek from 'dayjs/plugin/isoWeek';
import dayjs from 'dayjs';
dayjs.extend(advancedFormat)
dayjs.extend(customParseFormat)
dayjs.extend(weekYear)
dayjs.extend(weekOfYear)
dayjs.extend(isoWeek)
dayjs.extend(isoWeeksInYear)

console.log(dayjs('2020-12', 'YYYY-ww', true).format('YYYY-ww') ==='2020-12')
// false
```

**Expected behavior**
week formater cannot self-format

**Information**
- Day.js Version [v1.11.8]
- OS: [macos ]
- Browser [chrome 114.0.5735.133]
- Time zone: [every]

Reproduce the example with the listed Day.js plugins, starting with customParseFormat, weekYear, weekOfYear, and isoWeek. Trace the parsing and formatting paths for the YYYY-ww tokens in those plugin entry points. Done means the strict parse of '2020-12' formats back to '2020-12' and the relevant tests pass.

Written by the indexing model from the issue text.