Dropped spans when the transaction has more than 500 spans(default), how is it decided to drop which spans?

Kibana version : 6.8

Elasticsearch version : 6.8

APM Server version : 6.8

APM Agent language and version : JavaAgent 1.9

Original install method (e.g. download page, yum, deb, from source, etc.) and version : download tar.gz from elastic official site

Description of the problem including expected versus actual behavior. Please include screenshots (if relevant):
Spans are dropped when the transaction has more than 500 spans(default), how is it decided to drop which spans? Or the spans, after the limit 500 is reached, are dropped?
I just wanted to clarify on which merit the spans are dropped.
My concern is, what if they're the problematic ones, which need to be reviewed?

Response would be appreciated. Thanks!

After 500 spans have been recorded for a transaction, the agent will drop all further spans. See also https://www.elastic.co/guide/en/apm/agent/java/current/config-core.html#config-transaction-max-spans

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