Nope still get the error dialog after clearing cache.
Also it's very broken in Brave, you have to turn off shields to get it partially working - not sure what was changed with cookies/sessions between 5.0 and 5.1?
If clearing browser's cache doesn't help, it's likely a browser issue.
There are some reports about brave display issues here on the forum. I just link for a start:
Not a rendering issue, Brave only modifies what cookies and URLs are blocked to try and increase privacy.
Brave is Chrome, not almost, it is built on chrome using the same rendering engine. I build my sites testing against Brave the main difference is it protecting against cross site tracking.
And with shields down it still has the same error (oh also does it in Chrome etc)
Clearing the cache looks like it is masking the underlying issue here.