I also have Convoy S2+ that stays only on the moonlight mode no matter which mode it was in. but mine was direct driven using BLF A6 driver and the bond wire blown hence the “eternal moonlight” mode. i replace it with XPL since i want this to be direct driven and all is good. Not sure why yours could be blown since it is not directly driven.
ps. blown bond wire will make the XML always lit up like in the moonlight and the latest gen XML2 have weak bond wire replace it with XPL and you wont have problem with blown bond wire. Dont pust XML2 pass 5A.