There’s something wrong with UE5 , this is the second time i lose my character mesh and movement components like this , first time i tried to make a new blue print and on replacing blueprints it crashed without saving and when i restarted the editor it all loaded everything normally , and the second time before this happen everything was working fine last night without an error but in the morning this happened again and im tired of having to create a character and do change all details from scratch just to fix this issue , if you think i may have used a blueprint that caused this my answer is no everything was working perfectly fine when i saved the project before closing
That must be very annoying 
I would recommend to start on a fresh project, also double check your hdd(with Hard Disk Sentinel) or ssd if it healthy just in case in relation to saving.
my hard drive is fine , it runs games fine , as you said project must be bugged , im at pre production stage , just testing out AI and mechanics , when i get better results ill make a new project and improve from there