Hi, this was fixed by:
commit f591ad28f1bcec67f17a123766f798d16bec5373 Author: Andrew Whatson <what...@gmail.com> Date: Fri Jan 22 20:10:10 2021 +1000 Fix suspendable implementation of 'get-bytevector-some!' * module/ice-9/suspendable-ports.scm (get-bytevector-some!): Fix incorrect arguments to bytevector-copy! which was released with guile 3.0.6. - d4ryus