Arch: broken lib-llvm dependency using postgresql on Manjaro

I have a database server running Manjaro 20.0 and postgresql 12.1-2 A recent update has prevented complex queries from running - simple select queries execute ok, but larger select queries with joins generate the following error: Error: could not load library "/usr/lib/postgresql/llvmjit.so": libLLVM-9.so: cannot open shared object file: No such file or directory Checking pacman -Qi shows me that postgresql has as a dependency llvm-libs, and that this package updated from 9.0.1-2 to 10.0.0-1 when I updated a few days ago I tried reverting llvm-libs to the 9.0.1-2 version in the pacman cache, but running the same query generates a similar error: Error: could not load library "/usr/lib/postgresql/llvmjit.so": libffi.so.6: cannot open shared object file: No such file or directory It seems there is a dependency issue here that needs to be corrected - but I haven't found any relevant bug reports, and I'm not sure where I should direct this issue - to the Arch linux package repository, the llvm-libs maintainer, or postgresql maintainer? And is there anything I can do to revert this issue in the meantime?