webform_ui routes issue, sometimes route not found exception is thrown

Hi everyone,

I have an issue when I am trying to reach this (admin/structure/webform/manage/[webform_id]) route.
Sometimes it happens after cache clear, sometimes after webform duplicate or when we try to reach new webform just after creation - after a while when we are trying to reopen this page again everything works fine.

I have got this exception:
'Route "entity.webform_ui.element" does not exist.'

but not always, sometimes route names are different (but I am doing the same action):
entity.webform_ui.element.add_page
entity.webform_ui.element.add_page
entity.webform_ui.element.duplicate_form
etc.

probably the scheme is that they are alwas from webform_ui.routing.yml file

I am logging all routes from DB router table when 500 error appears and I havent got this route in my log, when I am checking it manually it exists - how is it happens (is it removed and created again)?

It looks like routes don't have enough time to generate (and it is random which route will be missing) - when we are lucky we will not have an exception.

It happens on our testing environments, on local it is not reproducible - we have the same docker containers on all env.