Invalid date of date -d "12345.123456789 seconds ago" +"%s.%N"

```shell
date -d "1234.123456789 seconds ago" +"%s.%N"
1759036169.144756082

date -d "12345.123456789 seconds ago" +"%s.%N"
date: invalid date '12345.123456789 seconds ago'
```

```shell
date --version
date (uutils coreutils) 0.2.2

lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu Questing Quokka (development branch)
Release:	25.10
Codename:	questing
```