Error MWAN3 not connecting when all off wan offline->online

My router was installed new version lede and mwan3.
wan1 online + wan2 offline -> mwan3 ok
wan1 offline + wan2 online -> mwan3 ok
but when wan1 and wan2 offline-> online, mmwan3 not connecting, i must restart! help me, plz!

Hi! did you find the source of the bug?

Sounds somehow similar to my problem here: