[exim] anyone using SRS with cutthrough_delivery?

I'm very interested if anyone is using Exim SRS facility
(https://www.exim.org/exim-html-current/doc/html/spec_html/ch-dkim_spf_srs_and_dmarc.html#SECTSRS)
together with control = cutthrough_delivery
(https://www.exim.org/exim-html-current/doc/html/spec_html/ch-access_control_lists.html#vi494)

A specific questions to those who might be using SRS with
cutthrough_delivery: does the remote server see original envelope
sender, or SRS encoded envelope sender?

The reason for asking is that my own tests _so far_ indicate that
return_path option of the smtp transport seem to be ignored with
cutthrough_delivery.

So if you're using SRS with cutthrough_delivery, please check whether
return path is really getting rewritten.

The question is closely related to https://bugs.exim.org/3071

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