Nice, thank you very much for your answer, I didn't know the command "indi_setprop" existed, this is quite handy for debugging !
I am using a custom python implementation of indi client (not the official pyindi, that I stopped using a while ago because of poor maintenance status).
Actually I realized what was the issue, and it was not related to the lx200 mount driver implementation.

I was sending 2 TARGET_EOD_COORD set in a row, without waiting for the end of the goto.
What happened is that I was received a TELESCOPE_ABORT_MOTION switch, and the TARGET_EOD_COORD was set to IDLE value (instead of the BUSY I expected).

I fixed my script and now everything is working as expected

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