After the parasite possesses the mc, this happens
Did you use the online save editor is try to give yourself a ton of money? Cause that's the point where you lose your inventory, and if you have more than the initial 80 gold you got from the chest in your room earlier in the tutorial, the game appears to have a conniption. Happened to me, thought maybe it was my modified stats. Nope, they worked just fine (mostly). Touching the inventory however is what caused it to crash there for me. I didn't get any crashes from high stats, but I think changing them might have had wonky consequences with the combat. Just changing one of the initial quests to reward an absurd amount of XP and jumping up to Lv15 'naturally' had me being more effective in combat even though my on-paper stats were lower than my previous experimentation.
Likewise you can use the editor to change it and your other inventory items after the fact. Just know that it won't show properly unless you also change the 'gold earned' variable along with the inventory variable. For whatever reason, changing the gold in the inventory from 125 to 125,000 didn't work until I changed that 'earned gold' variable to 125,000 as well. When I did, suddenly the copper shards I had also modified shot up from 6 to 4,000 as well. No idea why that is, unless this is specifically some sort of purposeful anti-tampering code fuckery.
^^ The two variables I had to change, after getting though the tutorial, in order to actually have stupid money with the save editor. The lower line is the corresponding inventory item, which before you modify it should be your current gold amount (125 if right out of the tutorial). Don't trust that inventory string number either, as that changes between saves (or at least it was different when I when back to double check all of this). But if you search for the amount of gold you have (like 125), so long as nothing else in your inventory shares that number, it should be the only 'inventory' lines that shows up in the editor.
The upper variable the is double checker variable that won't show any changes you've made to the inventory unless it too is modified. If I had to hazard a guess, the game probably runs some sort of inventory check and if the amount of inventory gold exceeds the 'total earned' variable, it does some sort of reversion or otherwise caps the inventory items at some arbitrary amount. Again, before I changed the 'total earned' variable, the changes I made to the amount of copper shards and Gems didn't appear. The amounts were changed and saved to the file, but didn't make a difference when the save was loaded in game. Raising the 'earned total' to match the inventory gold amount, for whatever reason, allowed the modified amounts of Copper and Gems to also take effect.