FFT incompatibility with MKL2023
As reported in #716 (closed) FFT issues appeared for MKL. The 2022 version pin in !2221 (merged) seems to have worked around it, so it should be investigated what exactly the 2023 version broke.
(This probably isn't conda-specific, with conda just receiving the new version first.)
cc @duncanmmacleod (but not assigning), let's see who can take it on, maybe also @adam-mercer @karl-wette @jolien-creighton