A screenshot of the error is provided, I think there are extra characters in the form, these should not appear, it seems to be caused by a decoding error. Note that the transfer method "transfer-encoding: chunked".
Posted on:29 Sep 2020 18:54
Arguably, the WebForms Inspector should refrain from displaying anything in the body until the user hits the "Click to Decode" button at the top.
Alternatively, the GetRequestBodyAsString() method could be used to get the unchunked body bytes.
In terms of priority, this is probably pretty low, because browsers do not used Chunked Request encoding for form submissions.