Usage of page tstamp field is not possible

[Patta]

In some cases, we just want a random id as slug (e.g. newsletter). The tstamp field could be used for that.
However, with the below tsconfig, the tstamp field is not respected as field for the slug generation.

TCEMAIN.pages.slug.generatorOptions {
    fields = tstamp
}

With this, the fallback slug is generated. e.g. "/default-831d81656a"
Is it possible to use the tstamp field for the slug?
If not, it would be nice if the fallback slug prefix "default" could be configurable or removed.

TYPO3 11.5.28
PHP 8.1.20
masi 2.0.1
composer mode