Quick answer: Bug reports from old builds get triaged at the cost of new builds. Auto-routing by build version (old builds to maintenance team, new to feature team) preserves focus.
Old-build reports are different work. Separate them.
Auto-tag by build
SDK captures build SHA; bug tracker tags. Routing by tag.
Per-build team
Maintenance team for old builds; feature team for new. Separate focus.
Escalation
Old build reports that match a known new-build fix get auto-closed with link.
Audit per-build volume
Old build report volume; if high, communicate.
“Build version is a routing dimension. Use it.”
If your studio has long support windows, the per-build routing is operational. Plan it.