Bot API 429s during JMeter load test ramp-up

Just noticed that the /api/v2/bots endpoint returns 429 Too Many Requests immediately when JMeter hits 20 threads from Singapore. Running JMeter 5.6.2. The docs state standard rate limits apply, but the threshold seems incredibly low for basic bot metadata retrieval. Hitting 429s instantly despite valid OAuth tokens. Is there a specific limit for bot API calls during load testing, or is this a known issue with the current GC infrastructure in the Asia region?