I'll debug a little bit more to get you the required details, from what I can gather so far:
- It starts after validation of all blocks (which I'm not a 100% sure finished fully)
- In the logs I see a new peer connecting, a transaction handler being called, and then immediately a message stating the failure to generate a block locator (I'm thinking it might be a not-yet-propagated block, validation being stuck, or an invalid request)
- I don't see any new blocks coming in at this point.
- Transactions are coming in just fine