I experienced the same thing, but I found a workaround!

Find an example event with parm1 that looks like:
<flowname>.75f7da0cdb7a8110d02bfb2439961963.41ceca4187120010663ca1bb36cb0b06.If$1.Wait For Condition Check.If$1.Wait For Condition.If$1.Wait For Condition Wait./monitor/operation

Modify the last section of the parm1 to look like:
<flowname>.75f7da0cdb7a8110d02bfb2439961963.41ceca4187120010663ca1bb36cb0b06.If$1.Wait For Condition Check.If$1.Wait For Condition.If$1.Wait For Condition Wait./condition/complete

Also set the state to Ready, and clear the Processed field, and then do an insert and stay.

And then it force completed the Flow. The key bit is that "condition/complete" at the end, seems like those are the magic words.