Service Bindings and memory limits

Service Binding section in documentation covers CPU, connection limit and others About Service bindings · Cloudflare Workers docs but it does not cover the 128MB limit of an isolate. What happens if my service A allocates 80MB of memory that is never freed and calls service B that also allocated 80MB. Will it blow as B will be hosted in A or will it just work, sharing CPU and connection limit but keeping the B separate in other cases (like memory).

It’d be great if you could sprinkle docs with isolates and actual underlying design of service bindings.