JSON string errors caused by 4-bit quant or KV Cachce quant?

500 Failed to parse tool call arguments as JSON: [json.exception.parse_error.101] parse error at line 1, column 64: syntax error while parsing value - invalid string: missing closing quote; last read

That's the error that's been haunting me. But I don't really know the cause, it only seems to occur when the context has grown very large, like a very long vibe coding session.