"invalid MIME part type" error when modifying sap odata batch responses

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when modifying the response body of an odata request, i get the following error in the console:

i'm not really sure what's going on but from this stackoverflow answer i think tamperdev may be incorrectly changing the line endings in the body from CRLF to LF?

sorry i can't really share much information about the request as it's for an internal site