EtherCAT Deficiency in Line Topology

Hello everybody,
I've seen an issue in EtherCAT line topology which I don't know, there is any solution for that or not? I have a Master(Controller) with one output port of EtherCAT and it is wired to input port of a servo drive and again from the output port of the servo drive the cable goes to another drive and wiring continues until 30th drive. In operation, when one drive in the middle is bypassed, from that drive all the sequences shifted one drive ahead!!!

By the way, I've done Sync Unit assignment for all drive and all of the devices are from BECKHOFF. Is there any solution for this issue except changing topology from line to star??
Thanks in advance for any responses
 
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