sequencer export edl and xml incorrect start frame

I used sequencer to export avi and edl and xml.the start frame of edl and the start frame of xml are 1.I did not modify this edl or xml then I import edl or xml directly back to the timeline, then there will be one frame missing at the end of each clip. I tried to manually modify the start frame of edl and xml to 0 to get the correct. After a lot of testing, I think it should be 0. where did I go wrong? I encountered this error in both 4.24 and 4.25.

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Hello,

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Thanks