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When I ran Katana as an SDK, it was only crawling a single URL. Upon investigating, I found that it was due to the 'Do' function in 'pkg/engine/common/base.go.' The structure for asynchronously adding data to the queue wasn't working in conjunction with the for loop. The for loop wasn't waiting for the result of the asynchronous function, so when a new value arrived in the queue, the for loop had already completed. To resolve this, I submitted this pull request.
Issue link: #714
I've provided necessary explanations at the location where the issue is located.