Encrypted disk is "corrupt" but unencrypted is fine

I have a USB hard drive that I want to use as my Time Machine backup disk. I want it to be encrypted. If I partition it as an encrypted disk, it finishes fine; but then if I run First Aid, it says it's corrupt. If I partition it UNencrypted, First Aid says it's fine. I've repeated it multiple times. Encrypted = corrupt. Unencrypted = okay. Why would the disk only read as corrupt when encrypted? Running OS 10.15 on a 2014 MacBook This is the First Aid log when I get the error. If it's unencrypted, it's short and sweet -- all "okay". Running First Aid on “WD easystore 25FA Media” (disk2) Checking prerequisites Checking the partition list Checking the partition map size Checking for an EFI system partition Checking the EFI system partition’s size Checking the EFI system partition’s file system Checking the EFI system partition’s folder content Checking all HFS data partition loader spaces Checking booter partitions Checking booter partition disk2s3 Verifying file system. Volume is already unmounted. Performing fsck_hfs -fn -x /dev/rdisk2s3 Checking Journaled HFS Plus volume. Checking extents overflow file. Checking catalog file. Checking multi-linked files. Checking catalog hierarchy. Checking extended attributes file. Checking volume bitmap. Checking volume information. The volume Boot OS X appears to be OK. File system check exit code is 0. Restoring the original state found as unmounted. Checking Core Storage Physical Volume partitions Verifying storage system Performing fsck_cs -n -x --lv --uuid 0AD74A3C-D0D6-42F5-B0D4-9FB8486ABC99 Checking volume disk2s2: Scan for Volume Headers disk2s2: Scan for Disk Labels Logical Volume Group 0AD74A3C-D0D6-42F5-B0D4-9FB8486ABC99 on 1 device disk2s2: Scan for Metadata Volume Logical Volume Group has a 24 MB Metadata Volume with double redundancy Start scanning metadata for a valid checkpoint Load and verify Segment Headers Load and verify Checkpoint Payload Load and verify Transaction Segment Load and verify Transaction Segment Incorporate 1 newer non-checkpoint transaction Load and verify Virtual Address Table Load and verify Segment Usage Table Load and verify Metadata Superblock Load and verify Logical Volumes B-Trees Logical Volume Group contains 1 Logical Volume Load and verify 2C6C36E4-9E7A-433B-847C-BEE4D39BFBF2 Load and verify B8B932A7-B825-48D5-A577-5485DDD0DE76 Load and verify Freespace Summary Load and verify Block Accounting Blocks on device 26EC24D8-82B4-4CA5-B361-FB2194641A72 are not accounted for by CoreStorage Unable to bootstrap transaction group 6: inconsistent crosscheck Continue scanning metadata for an older checkpoint Load and verify Segment Headers Load and verify Checkpoint Payload Load and verify Transaction Segment Incorporate 0 newer non-checkpoint transactions Load and verify Virtual Address Table Load and verify Segment Usage Table Load and verify Metadata Superblock Load and verify Logical Volumes B-Trees Logical Volume Group contains 0 Logical Volumes Load and verify Freespace Summary Load and verify Block Accounting Blocks on device 26EC24D8-82B4-4CA5-B361-FB2194641A72 are not accounted for by CoreStorage Unable to bootstrap transaction group 5: inconsistent crosscheck Continue scanning metadata for an older checkpoint Load and verify Segment Headers Load and verify Checkpoint Payload Load and verify Transaction Segment Incorporate 0 newer non-checkpoint transactions Load and verify Virtual Address Table Load and verify Segment Usage Table Load and verify Metadata Superblock Load and verify Logical Volumes B-Trees Logical Volume Group contains 0 Logical Volumes Load and verify Freespace Summary Load and verify Block Accounting Blocks on device 26EC24D8-82B4-4CA5-B361-FB2194641A72 are not accounted for by CoreStorage Unable to bootstrap transaction group 4: inconsistent crosscheck Continue scanning metadata for an older checkpoint Load and verify Segment Headers Load and verify Checkpoint Payload Load and verify Transaction Segment Incorporate 0 newer non-checkpoint transactions Load and verify Virtual Address Table Load and verify Segment Usage Table Load and verify Metadata Superblock Load and verify Logical Volumes B-Trees Logical Volume Group contains 0 Logical Volumes Load and verify Freespace Summary Load and verify Block Accounting Blocks on device 26EC24D8-82B4-4CA5-B361-FB2194641A72 are not accounted for by CoreStorage Unable to bootstrap transaction group 3: inconsistent crosscheck No valid commit checkpoint found The volume 0AD74A3C-D0D6-42F5-B0D4-9FB8486ABC99 was found corrupt and needs to be repaired Storage system check exit code is 1. Problems were found with the partition map which might prevent booting Storage system verify or repair failed. : (-69716) Operation successful.