This is the official repository of the TYPO3 extension powermail! Powermail is a well-known, editor-friendly, powerful and easy mailform extension for TYPO3
Can confirm this. {form.css} is also missing and probably some more like {page.css}. It's not possible to have different layouts on translated pages without adding workarounds.
On translated forms, {field.css} is empty even if a value was selected on the original language.
Tested on TYPO3 11.5.26 with powermail 10.7.0 and base templates.