The bandwidth of client dial-up Internet access of ROS PPPoE server is reduced by half

RouterOS General
1

The bandwidth of client dial-up Internet access of ROS PPPoE server is reduced by half，，If it is DHCP, it will be OK. What’s the reason。The device is 450Gx4.It’s the same with 1009。Have you met? How to solve this problem?
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2

ROS didn’t set any speed limit