A DESCRIPTION OF THE PROBLEM :
While formating a LocalDate with the DateTimeFormatter it occurs every time that the last 3 days of 2024 and 2025 where changed like the following:

2024-12-29 -> 2025-12-29
2024-12-30 -> 2025-12-30
2024-12-31 -> 2025-12-31
2025-12-29 -> 2026-12-29
2025-12-30 -> 2026-12-30
2025-12-31 -> 2026-12-31

I checked this with the following code snippet:
  public void testMyVersion() {
    System.out.println("testMyVersion()");
    DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("YYYYMMdd");
    for (int year = 2000; year < 2041; year++) {
      System.out.println("\nYear " + year);
      LocalDate date1 = LocalDate.of(year, Month.DECEMBER, 27);
      System.out.println(dateFormatter.format(date1));
      LocalDate date2 = LocalDate.of(year, Month.DECEMBER, 28);
      System.out.println(dateFormatter.format(date2));
      LocalDate date3 = LocalDate.of(year, Month.DECEMBER, 29);
      System.out.println(dateFormatter.format(date3));
      LocalDate date4 = LocalDate.of(year, Month.DECEMBER, 30);
      System.out.println(dateFormatter.format(date4));
      LocalDate date5 = LocalDate.of(year, Month.DECEMBER, 31);
      System.out.println(dateFormatter.format(date5));
    }
  }

It also appears in other years (i.e. 2029, 2030, 2031).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Use the DateTimeFormatter to format a LocalDate like 2025-12-30.

Code snippet I used to test.

  public void testMyVersion() {
    System.out.println("testMyVersion()");
    DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("YYYYMMdd");
    for (int year = 2000; year < 2041; year++) {
      System.out.println("\nYear " + year);
      LocalDate date1 = LocalDate.of(year, Month.DECEMBER, 27);
      System.out.println(dateFormatter.format(date1));
      LocalDate date2 = LocalDate.of(year, Month.DECEMBER, 28);
      System.out.println(dateFormatter.format(date2));
      LocalDate date3 = LocalDate.of(year, Month.DECEMBER, 29);
      System.out.println(dateFormatter.format(date3));
      LocalDate date4 = LocalDate.of(year, Month.DECEMBER, 30);
      System.out.println(dateFormatter.format(date4));
      LocalDate date5 = LocalDate.of(year, Month.DECEMBER, 31);
      System.out.println(dateFormatter.format(date5));
    }
  }


---------- BEGIN SOURCE ----------
  public void testMyVersion() {
    System.out.println("testMyVersion()");
    DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("YYYYMMdd");
    for (int year = 2000; year < 2041; year++) {
      System.out.println("\nYear " + year);
      LocalDate date1 = LocalDate.of(year, Month.DECEMBER, 27);
      System.out.println(dateFormatter.format(date1));
      LocalDate date2 = LocalDate.of(year, Month.DECEMBER, 28);
      System.out.println(dateFormatter.format(date2));
      LocalDate date3 = LocalDate.of(year, Month.DECEMBER, 29);
      System.out.println(dateFormatter.format(date3));
      LocalDate date4 = LocalDate.of(year, Month.DECEMBER, 30);
      System.out.println(dateFormatter.format(date4));
      LocalDate date5 = LocalDate.of(year, Month.DECEMBER, 31);
      System.out.println(dateFormatter.format(date5));
    }
  }

---------- END SOURCE ----------

FREQUENCY :
ALWAYS