Same problem with Mojave 10.14.2
It is the OneDrive folder - Personal Account.
Version 18.214.1021.0013
/dev/rdisk1s1:
/dev/rdisk1s1: fsck_apfs started at Wed Jan 9 15:40:41 2019
/dev/rdisk1s1: ** Checking the container superblock.
/dev/rdisk1s1: ** Checking the EFI jumpstart record.
/dev/rdisk1s1: ** Checking the space manager.
/dev/rdisk1s1: ** Checking the space manager free queue trees.
/dev/rdisk1s1: ** Checking the object map.
/dev/rdisk1s1: ** Checking volume.
/dev/rdisk1s1: ** Checking the APFS volume superblock.
/dev/rdisk1s1: ** The volume Macintosh HD was formatted by newfs_apfs (748.30.63) and last modified by apfs_kext (945.230.6).
/dev/rdisk1s1: ** Checking the object map.
/dev/rdisk1s1: ** Checking the snapshot metadata tree.
/dev/rdisk1s1: ** Checking the snapshot metadata.
/dev/rdisk1s1: ** Checking snapshot 1 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Checking snapshot 2 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Checking snapshot 3 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Checking snapshot 4 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Checking snapshot 5 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Checking snapshot 6 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
** Checking snap/dev/rdisk1s1: shot 7 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Checking snapshot 8 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Checking snapshot 9 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Checking snapshot 10 of 10.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Checking the extent ref tree.
/dev/rdisk1s1: ** Checking the fsroot tree.
/dev/rdisk1s1: warning: inode_val: object (oid 0x123bd1): invalid bsd_flags (0x10)
/dev/rdisk1s1: ** Verifying allocated space.
/dev/rdisk1s1: ** Performing deferred repairs.
/dev/rdisk1s1: ** The volume /dev/rdisk1s1 appears to be OK.
/dev/rdisk1s1: fsck_apfs completed at Wed Jan 9 15:45:08 2019
/dev/rdisk1s1:
/dev/rdisk1s2: fsck_apfs started at Wed Jan 9 15:51:47 2019
/dev/rdisk1s2: QUICKCHECK ONLY; FILESYSTEM CLEAN
/dev/rdisk1s2: fsck_apfs completed at Wed Jan 9 15:51:47 2019
Then run
find / -inum 1194961

Fix it!