Load error with active_support 7

[Annih]

With recent release of active_support 7.0.0 my grape apps are not loading anymore.
It fails with the error uninitialized constant ActiveSupport::XmlMini::IsolatedExecutionState (NameError), with following backtace:

/home/<redacted>/.bundle/ruby/2.7.0/gems/activesupport-7.0.0/lib/active_support/xml_mini.rb:184:in `current_thread_backend': uninitialized constant ActiveSupport::XmlMini::IsolatedExecutionState (NameError)
from /home/<redacted>/.bundle/ruby/2.7.0/gems/activesupport-7.0.0/lib/active_support/xml_mini.rb:103:in `backend='
from /home/<redacted>/.bundle/ruby/2.7.0/gems/activesupport-7.0.0/lib/active_support/xml_mini.rb:201:in `<module:ActiveSupport>'
from /home/<redacted>/.bundle/ruby/2.7.0/gems/activesupport-7.0.0/lib/active_support/xml_mini.rb:11:in `<top (required)>'
from /home/<redacted>/.bundle/ruby/2.7.0/gems/activesupport-7.0.0/lib/active_support/core_ext/array/conversions.rb:3:in `require'
from /home/<redacted>/.bundle/ruby/2.7.0/gems/activesupport-7.0.0/lib/active_support/core_ext/array/conversions.rb:3:in `<top (required)>'
from /home/<redacted>/.bundle/ruby/2.7.0/gems/grape-1.6.0/lib/grape.rb:15:in `require'
from /home/<redacted>/.bundle/ruby/2.7.0/gems/grape-1.6.0/lib/grape.rb:15:in `<top (required)>'

Someone reported an issue on rails (rails/rails#43851) and there even have been an attempt to fix it on this side; but it seems the issue is due to an incorrect way to require active_support's extensions.
According to this guide, it seems you should do a normal require 'active_support' prior to any more specific active_support import.