For awhile now (sorry, I'm terrible at keeping track of how long ago – it's been at least three weeks, but could easily be double that) a simple Google Docs spreadsheet I own has been throwing this error, constantly, and only in Orion:

Reloading clears it, but it recurs within less than a minute, again and again and again.
I've tried:
• Compatibility mode
• Logging all the way out of Google, deleting all Google-related website data (cookies, etc), and logging back in
• Creating a new Orion profile and logging into Google from there
None of these solved the problem.
No such error occurs with Safari or Firefox (I don't know about Chrome; I don't voluntarily install malware on my computer)
0.99.137-beta (WebKit 623.1.8.0.0) under MacOS 15.7.1
Sequoia (15)