Buildbox-casd works with grpc 1.25 but segfaults 1.26 on MacOSX

Context

I followed https://buildstream.build/buildbox_install.html for MacOSX. I tried 0.0.4 and 0.0.5 branches, with

• grpc 1.2.6
• protobuf 3.11.2

which are installed using homebrew.

It crashed with Segmentation Fault: 11, here is the lldb output. On a very similar MacOSX, I had a chance to see it working with grpc 1.23 and protobuf 3.10.x. Guessing that something happened between 1.23 and 1.26, I tried grpc 1.25 and it worked.

Is there a chance Linux build might also be affected?