Bumping this thread up because i suddenly started having this exact problem.
Converse with fellow players
Yesterday during a Deus UQ run i had a period where i couldn't attack at all after Deus flings the MPA off its core during the map split phase.
I checked if my Nemesis TMG had disappeared, it wasn't but it showed 764/770 required R-atk. After a minute of not being able to do anything i suddenly could use my weapon again and keep fighting. I checked my R-atk stats from weapon requirements and it showed 964 now.
Somehow my mag stats stopped applying after the scene in Deus where it pulls out its wings and keeps its core out.
This is a strat i use with my current gear, Nemesis TMG with Kaiser set + Union leg unit, no affixes of worth.
Start by locking on to a leg, use Equillibrium on the 1st attack. Chase with Grim Barrage, cancel into Infinite Fire t.0 > sat aim until broken, repeat until downed CT activate, chain up to 50-60, Grim Barrage 1st half into Infinite Fire t.0, repeat until 2 legs remain. Break 2 last legs same as the 1st 4, do a few Infinite Fire t.0 loops (NO CT) Before double gets up start building chain, keep chaining for 1st 2 cars then detonate chain. Usually Double dies at this point for me.
On PD itself, avoid taking as much damage as i can and break parts without CT, use Equillibrium when the bits come out, CT the weakspot as it comes available at count 30-50, detonate with grim barrage 1st half into infinite fire t.0. Repeat until the torso comes out Use ChronoLapse to destroy bits and avoid damage during PD attacks, grim barrage/sat aim and normal attack until all gone (save some PP for chest) When PD recoils, grim barrage towards, let both parts of it go, Inifinite fire t.0 into sat aim (for me this usually breaks the chest eye) CT the face to 60-70 and detonate with whatever you can do most damage with (should skip straight to persona phase) Persona, save or spend your CT and just survive and do damage when you can with Chronolapse/equillibrium. Last eye, if you have CT available chain the eye and detonate with chronolapse as it fires the death laser, i frames keep you alive. Finish as necessary.
This is pretty much how all my solo PD runs go, probably not the best/fastest strat but gives me consistent runs.
Offense is taken, not given. Attention seeking and baiting like this is quite annoying, and granted i fell for it since i did post this comment. And most people spouting the rhetoric that started this thread are so far up their own backsides in "i'm better than you" smugness they're making multiple loops like a screwed up overly sensitive ouroboros.
Well, you can either bow or katana everything or Katana mobs and bow bosses (when lvl 85 skills are out).
When crafting is out, Sharp Bomber (dunno the NA name) type 0 becomes your be all end all Bow PA, and Sakura Endo (cherry blossom finish) type0 your basic katana PA. You can either bow or katana any boss/enemy in the game, but bow is better at single target and Katana is better at multi target types of fights.
Since it isn't anywhere nor was your account hacked and the item stolen most likely.
You've fallen victim to one of the wonderful "features" of NA release of the game, disappearing items. I did a quick search and it seems others have had this happen as well where mostly consumables just Thanos themselves out of existence for no apparent reason.