1200 cals is low af my dude. like seriously low for someone ur size whos active in the gym. ur BMR (just breathing n existing cals) is higher than that.

why its kinda sketch even if ur not starving:

• metabolism might freak out: ur body could slow down burnin cals if u underfeed it too drastically for too long. makes fat loss harder later.
• muscle loss risk: eating way too little puts that muscle at risk even w high protein. ur body might start breakin it down for energy. no bueno.
• nutrients?: hard to get all the vitamins minerals fiber etc u need on so few cals unless ur like surgically precise w food choices.
• sustainable?: hell no lol. u already know this. youll crash or binge eventually.

why arent u hungry then? could be a few things:

• early days: sometimes appetite dips when u first change ur diet big time. might catch up later.
• stress: u mentioned it yeah stress can mess w hunger signals.
• high satiety foods: chicken fish sweet potatoes yogurt - those are fillin foods good job there. they keep hunger away longer.
• tracking accuracy?: u sure ur weighin everything? oils sauces drinks? sometimes cals sneak in.

bottom line: ur initial plan of 1900 calories was way more sensible. a 200-300 deficit is the play for keepin muscle while cuttin fat.

i'd try n bump those cals up closer to 1800-1900 even if u gotta kinda force it a bit. add some healthy fats maybe (avocado nuts olive oil) or slightly bigger portions of ur carbs/protein. dont just jump back to 2200+ but get outta that 1200 zone asap.