Strange sporadic assembly load failure messages

We're seeing function logs with assembly load failures like:

System.AggregateException : One or more errors occurred. ---> **Could not load file or assembly '3072 bytes loaded** from Microsoft.Azure.AppService.Proxy.Common, Version=0.3.0.0, Culture=neutral, PublicKey[Hidden Credential]<---

The issue is that "name" portion of the format string is not an assembly name, but a "bytes read" message of some sort. This is not specific to the above assembly, that's just an example.

@paulbatum recently saw many occurrences of this in our system logs for placeholder sites. The theory is that this is a sporadic failure, and the frequency of placeholder restarts/recompilations causes it to happen alot.

Search the repository for the assembly-load failure formatting and the “bytes loaded” text, then investigate whether placeholder-site restarts or recompilations reproduce the sporadic message. Done means assembly-load failures report the assembly name correctly instead of substituting a bytes-read message.

Written by the indexing model from the issue text.