To the point of your problem, maybe turn off Lore (or research it’s bugs/settings); it would be a great backup system if these corrupting bugs didn’t surround or sabotage it (not sure if connected), and it’s really meant for multi-dev teams. Everything around sync is apparently one big extremely dangerous unaddressed bug that can cost you a day’s work. Lore is a savior in that it saves a generous amount of backups, seemingly from the start of your project, and it can be used to revert some of the damages of what you’re experiencing, but the bug is… more powerful than Lore lol. All the changes you did mean to do that happened between when the failure starts and when you notice it have to be undone to make that reversion to the last stable state, so you have to make decisions like which of your work to sacrifice.
If you have Lore/revision control on keep auto-checkout and auto-undo on, and setting yourself as the only user/team member might make a difference.
For me, it would constantly nuke the guts of my project (brains stuff; class designers, accolades, etc.) and even keeped doing it in a duplicate of the project. I don’t have Lore/revision control on at all anymore and haven’t had the same problem, though Idk if the problems are actually connected to Lore or something not playing well with/sabotaging Lore. It’s, too exhausting; others have reported it, I reported it, I did a bunch of experiments for them and hopefully somebody did something on their end with the data/does something about that whole realm of failures, ever.
On console I think the editor is just a worthless gamble (like Hardcore mode in Lego where you’re more likely to die from a bug than an enemy) unless you can turn that off or are willing to risk wasting a day’s work at a time. They don’t have Lore OR local backups to undo the damages.
**Honest Discussion (Broader)**
Consider the entire software to be in alpha testing forever, not in a charming evolving way but like unfinished and untested. The honest truth is the editor’s design disrespects it’s users (and staff) with the most remedially childish and unnecessary UI/X and functional failures you could imagine and then some lot more, leaving things totally nonfunctional for years. The editor is too dim to sync, save, load, copy/paste, transform, a lot of really basic stuff. They don’t care to get basic, first things like ground collision right (Lego ships will fall through the map) YEARS later, whoever is Master of Priorities and Coin at Epic. Weapons may or may not fire at all and damage may or not register if they do was true a good part of this season in their most popular game mode and UEFN (weapons became worthless, do 1000 damage and 200 registers–an example of me going ‘what did I do wrong and why was it possible to do wrong’ where it turned out it was UEFN and the flagship game’s weapons didn’t work either). A simple search in editor may take 10-30 sec even if you have a state of the art machine with upgraded cache and a 64GB paging file. It is indefensible but normalized, even aggressively defended lol. This is not an intelligent or ethical company at it’s leadership or priorities -setting level.
Some awesome folks will comment and try to help in the forum (from Epic and not). But, it’s like the Klendathu Drop Scene where the colonists were massacred by the bugs in Starship Troopers; they’d need 20% more staff and to spend some of the money we give them on the things we actually asked for in order to address the emergent (would be categorically considered emergent in an enterprise software) bugs in this software alone. Have (or had? hard to follow) some really brilliant folks and state of the art bits but it’s all gold artifacts, largely incomplete or diminished by other nonworking parts, being bolted onto a dumpster fire. Every thing takes 10-100x longer than if it actually were the enterprise grade some of it’s presenters snarkily comment about it being–implying other more functional software is lesser.
I think we’re all here due to sunken cost fallacy cuz we spent so much time learning specifically HOW stupid and unethical these people are, and how to work around SOME of their willful ignorance. Staff probably v.much included and also here for sunken cost fallacy. What’s left of them. Ghead ban the truth mods it will unquestionably be brought up again because it is the truth. Or y’all could get worth some part of the money we give y’all cuz we’re not wrong, the countless users that tell the truth about how substandard every thing in this childish circus is other than the graphics. Nobody wants the best graphics before they want a coherent editor or good games.
You can do some really cool stuff with some’f the gold bits and they have a solid profit sharing model but I mean let your expectations be set straight cuz not calling things what they are is unethical and childish. It’s GOT a learning curve, but most of it’s issues have nothing to do with a learning curve, it’s just programmed wrong and in a way where I don’t wanna use the term but it’s got multiple disconnected brains that aren’t aware of one another and are mostly also all individually dysfunctional and unable to follow the plot. Some will pretend it’s all learning curve and user error, and I’m not sure if they’re delusional or dishonest, but it’s actually the above. A lot of the time it IS user error, but a lot of those times it’s only because the UI/X strays so far from common sense. And, it’s only a little more likely to be user error than it is just bad, wrong, totally nonfunctional, uniquely substandard, or, “working as intended” (which is apparently different from working correctly/at all, sometimes), so it’s justtt enough to keep you gaslighting yourself constantly. 
Unreal does not have a lot of the limitations that break basic features that UEFN does. It has a lot of the, broken things. They made a lot of great stuff and I get protecting IP but a. it’s not helping the actual talent make money when the actual talent is getting fired while the cheaper new hires and the more-liability-than-asset c-suite keep their jobs, and b. you’d think they’d get over hoarding assets and locking basic features around the time they blamed us for not giving them record-ENOUGH profit margins, outsourced Star Wars IP game dev to us entirely with half the resources entirely locked or in useless formats, and convinced Tencent they were gonna get us to make them money by outsourcing dev to us… Very cool, very smart, except you uh forgot to program the software that whole model relies on like professionals.
Nothing people haven’t said for years but: Give us professional, adult, enterprise-grade editing tools, basic features working, and we’ll prop up your greedsickness y’all. 
Obv these criticisms are entirely criticisms of leadership: I see where the talent did brilliant work but you didn’t let them finish, like more than half. You can’t have record profits, axe 1/5 your staff, blame us for too little profit (which, was always a lie, even considered by itself), give us childish broken tools, and outsource game dev to us. All of these cannot be true if Epic will make it y’all hope this helps get better soon Epic. <3
