Other fixes found by e2e test

[ikatson]

Debugging the e2e test and its failures, found a couple potential issues that are fixed here + some debugging code.

while E2E_TIMEOUT=1000000000 E2E_CLIENT_ITERS=1000 E2E_NUM_SERVERS=128 RUST_LOG=debug cargo test --features librqbit/async-bt test_e2e_download -- --nocapture > /tmp/test-log 2>&1; do :; done

CC @izderadicka