Okay, the component has been updated 
The update relies on a very recent core update — DEV: Improve user handling and access in post components by megothss · Pull Request #34013 · discourse/discourse · GitHub. If you are on 3.5.0.beta9-dev, you will need to be running that commit in order for this component to work. I have added a compatibility file to help protect most cases, but if you are someone who likes to update themes/components manually, please check your Discourse version.
Was doing some maintenance today and saw this had been updated. Thanks for taking the time to do so, it is appreciated.
Hi, after weeks of working fine, I have now this error in the console:
Very strange! Will take a look and see if I can figure out what’s going on.
@patrickemin I’ve pushed a fix for the deprecation notice that I’m hoping may also prevent the error you were encountering (I could not reproduce the error, just the deprecation notice). Can you see if the issue clears up after you update the component?
Unfortunately, no, the issue (replies not visible until I refresh manualy the page) is still here.
Try one more update 
I figured out the way to reproduce the issue right after I posted and pushed another fix.
Not any better… Same issue.
Is there any chance you didn’t refresh the page you used to test after updating the component a second time?
I was getting the includes error in your screenshot after the first update when posting a reply, but I cannot reproduce any error now after the last update.
Good catch, it’s now working ! Thanks !