Failed to load proto files

[stuomin3n]

cln-application fails to load proto files.

Environment variable used LIGHTNING_GRPC_PROTO_PATH:

Tried so far:

• empty for default
• https://github.com/ElementsProject/lightning/tree/master/cln-grpc/proto
• https://github.com/ElementsProject/cln-application/tree/main/apps/backend/proto
• downloaded proto files on disk

What am I missing?