mmm. yeah i get that there too. works on https://nostr.com though.
Discussion
You are right. My local client built from Branle, and I also tried to reply to note from https:// branle.netlify.app ,it got the error too.
I will try to build another local client from https://github.com/arcbtc/nostr
ps: this reply from https://nostr.com
It works well for me now after I try firefox in Troubleshoot mode. I dont know if there is anything about that. Anyway it can work now.