I've spent a lot of time on my desk setup, and there's nothing else I can think of that I would change.
pending = combined.slice(start);
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Map Version Synchronicity (Important!): For HH-Routing to work correctly when a route crosses multiple map files (e.g., different countries or regions), all those map files MUST be from the same generation date (i.e., downloaded from OsmAnd around the same time, based on the same underlying OpenStreetMap data version and pre-calculation run).
for (const arr of arrays) { result.set(arr, offset); offset += arr.length; }