[Bug] default DateBuilder is wrong when scrolling

[Faaatman]

Describe the bug
Dates are shown correctly between messages but when scrolling their places change moving to the bottom.

To Reproduce
Steps to reproduce the behavior:

1. Scroll up
2. Scroll down back to the bottom
3. Dates then will be wrong

Expected behavior
Dates shouldn't have changed.

Screenshots
correct dates and these are the dates after scrolling

Desktop (please complete the following information):

• OS: Mac
• Device: iPhone 11 Pro real device
• Flutter Version: 2.2.3 • channel stable
• Dart Version: 2.13.4
• Version 1.1.15-nullsafety

[pratamarama]

same here