Region can't be empty if it's not the last region

This line https://git.drupalcode.org/project/layout_builder_awesome_sections/-/mer... only get regions that have blocks. So when initialization of the $build variable, regions with blocks come first.
$build [
'second' => 'some value'
]
When you push author regions attributes will make the $build like this.
$build [
'second' => 'some value with blocks',
'first' => 'some value without block',
'third' => 'some value without block'
]
So will render the Second region first, then is the First region, etc.
https://git.drupalcode.org/project/layout_builder_awesome_sections/-/blo...