This happens in Firefox browsers only (Not in Brave, Edge..) It happens persistently, all the time now.
While in https://translate.kagi.com/**proofread** mode
An error occurred during proofreading (SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data)
That besides swallowing the first few letters or whole word.
I use the Kagi Translate function all the time. Now I switch to other browsers to avoid the problem.

Normal use without errors thrown.