My Minecraft Bedrock World Glitched After 5 Weeks Of Playing On It

My Minecraft world glitched after 5 weeks or so. I was playing on it one night and then the next day my world had all these holes in it. I cant recover any of my items in those chunks. Could you possibly reset those chunks? I really don't care if you don't recover the items in the chunks but I wish to at least keep all the other remaining stuff that didn't glitch. Thanks!