group by due and similar should put Invalid date heading before the headings for valid dates.

[claremacrae]

Please check that this issue hasn't been reported before.

• I searched previous Bug Reports didn't find any similar reports.

Expected Behavior

Note: This issue refers to due dates, but the same applies to all the date fields.

group by due and similar should put tasks with invalid dates should be the first heading, Invalid date, as action is required.

Note: this follows on from #2589.

Current behaviour

Current the Invalid date heading is after all valid dates.

Steps to reproduce

1. Create a note, and call it Invalid dates with Sorting and Grouping
2. View it in an editing mode
3. Use Paste and Match Style in the following content:

# Invalid dates with Sorting and Grouping

## Tasks

Numbers indicate the sort order I feel is useful, as invalid dates require action to fix them, so they should be prioritised.

- [ ] #task 1 invalid due date 📅 1999-02-32
- [ ] #task 2 valid over-due date 📅 2023-01-01
- [ ] #task 3 valid future-due date 📅 2050-01-01
- [ ] #task 4 undated

## Group by due - built-in

`Invalid date` should be the first heading, as action is required.

```tasks
group by due

path includes {{query.file.path}}
hide backlinks
hide postpone button
hide task count
```

4. View the file in Live Preview or Reading mode.

Actual output

Expected output

Invalid date should be the first heading.

Which Operating Systems are you using?

• Android
• iPhone/iPad
• Linux
• macOS
• Windows

Obsidian Version

1.5.3

Tasks Plugin Version

5.6.0

Checks

• I have tried it with all other plugins disabled and the error still occurs

Possible solution

No response