Verify future messages

[HDauven]

Summary

As discussed prior and as detailed in this advisory, we need to fix a potential memory leak.

Solution

The advisory provides multiple pathways forward.

[fed-franz]

As discussed, we are going to temporarily disable future-message repropagation.

The proper solution will be implemented in the future and includes:

• sanity check of future messages
• filtering of duplicates

[autholykos]

This has been deprioritized in favor of #2247