TSS mode: logs not moving after "HintsControllerImpl - Voting for own preprocessed keys".

CN version=v0.73.0-rc.4
CN hgcaa.log is not progressing after the lines:

`HintsControllerImpl - Voting for own preprocessed keys`.

(Logs https://perf.analytics.eng.hashgraph.io/ephemeral/test_runs/v0.73.0-rc.4_AdHoc5_727/solo_deploy/podlog_solo-sdpt-n5/network-node1_logs/)

hence Solo deployment cannot detect TSS readiness statement and fails by timeout, e.g.:
https://github.com/hiero-ledger/hiero-consensus-node/actions/runs/24351720366/job/71107734063#step:41:544

Jstack report of such CN state: https://perf.analytics.eng.hashgraph.io/ephemeral/test_runs/v0.73.0-rc.4_AdHoc5_727/solo_deploy/podlog_solo-sdpt-n5/network-node1_logs/jstack.txt

Be advised, this step is OK with CN 'main'

Start with the linked hgcaa.log and jstack.txt for the v0.73.0-rc.4 Solo deployment, focusing on the state after “HintsControllerImpl - Voting for own preprocessed keys.” Compare that behavior with CN main, then trace the TSS readiness detection and timeout shown in the linked GitHub Actions job. Done means the logs progress and Solo detects TSS readiness without timing out.

Written by the indexing model from the issue text.