I've been hitting this for the past few hours, after downloading my Realm's world and removing the DIM-1 folder to reset the nether after updating to 1.16. Upload gets to 100% before failing with a 500 error code, no message. Looking in the world folder, I have a "realms-upload.log", the last line of which is "Validated 1541 files, 1416 accepted, 124 rejected." This prompted me to remove all datapacks in my world, however upload failed for the same reason. After an entire day of struggling to even download my world due to server timeouts, this is beyond frustrating.
I've been hitting this for the past few hours, after downloading my Realm's world and removing the DIM-1 folder to reset the nether after updating to 1.16. Upload gets to 100% before failing with a 500 error code, no message. Looking in the world folder, I have a "realms-upload.log", the last line of which is "Validated 1541 files, 1416 accepted, 124 rejected." This prompted me to remove all datapacks in my world, however upload failed for the same reason. After an entire day of struggling to even download my world due to server timeouts, this is beyond frustrating.