Hi,
Long time observer, this is my first post (so be nice to me please :-) ). Being *G, I upgraded against Award miles my long haul flight beginning of Nov 2018. I observed exactly the same behavior as OP stated here.
Awards/Status miles were not credited automatically, upon Request (via miles-and-more webpage) - Miles and More account currently shows mess with booking classes, the same flight once with note "not eligible to credit", multiple times (probably number of requests to be credited with note "already credited", but 0 miles credited at all.
I have filled in regular claim about missing miles via lh.com - no reply up to now, only automatic reply stating - "will come back to you as soon as possible" like. Any suggestion how to receive missing miles? As *G I am currently missing 4,5K miles to renew my *G status and those are exactly these miles, from this affected flight.
Thx.