bcache fails to attach local ssd as caching device in google cloud

I'm trying to setup bcache in an instance in google cloud using a raid of local SSDs as caching device but everything fails in the attach phase of the process. For testing purposes I created a new instance with blank disks (two SSDs and four Local SSDs). The objective is to have one regular SSD as backing device and form a raid with the 4 Local SSDs and use that device as caching. In the output below you can see the steps taken (the outcome is the same when using a raid, I just used one Local SSD for simplicity here and because I believe the issue is not related to raid but to the disks themselves). When using the Local SSD as caching device, I fail to attach the caching device to the backing device. When instead I use a regular SSD for caching device, you can see that everything works as expected. **The question for you experts out there is: Are there any known limitations for the Local SSDs or am I doing anything wrong (or maybe there are some extra steps needed)?** For reference, these are devices being used: /dev/sdb => Backing Device /dev/sdc => SSD Caching Device /dev/nvme0n1 => Local SSD Single Caching Device

# apt update && apt install mdadm bcache-tools -y

# make-bcache -B /dev/sdb
UUID:			cb10650f-cf60-4a96-81eb-7149ae650f94
Set UUID:		dc0a7f3a-de46-4b00-84f4-4aa40c203745
version:		1
block_size:		1
data_offset:		16

# mkfs.ext4 -L cached /dev/bcache0

# make-bcache -C /dev/nvme0n1
UUID:			c5a33c1e-e1ef-4d3d-a5ac-5d0adc340f43
Set UUID:		228dcba5-6085-47a1-b2e9-eff68dd6ac14
version:		0
nbuckets:		768000
block_size:		8
bucket_size:		1024
nr_in_set:		1
nr_this_dev:		0
first_bucket:		1

# bcache-super-show /dev/nvme0n1
sb.magic		ok
sb.first_sector		8 [match]
sb.csum			674DD52F06C4562B [match]
sb.version		3 [cache device]

dev.label		(empty)
dev.uuid		c5a33c1e-e1ef-4d3d-a5ac-5d0adc340f43
dev.sectors_per_block	8
dev.sectors_per_bucket	1024
dev.cache.first_sector	1024
dev.cache.cache_sectors	786430976
dev.cache.total_sectors	786432000
dev.cache.ordered	yes
dev.cache.discard	no
dev.cache.pos		0
dev.cache.replacement	0 [lru]

cset.uuid		228dcba5-6085-47a1-b2e9-eff68dd6ac14

# echo 228dcba5-6085-47a1-b2e9-eff68dd6ac14 > /sys/block/bcache0/bcache/attach
-bash: echo: write error: Invalid argument

# make-bcache -C /dev/sdc
UUID:			55c95063-9aa7-4d2c-8c8c-d4d34d35a7ad
Set UUID:		2de3ccef-a7eb-4620-8b6d-265d0a06da17
version:		0
nbuckets:		204800
block_size:		1
bucket_size:		1024
nr_in_set:		1
nr_this_dev:		0
first_bucket:		1

# bcache-super-show /dev/sdc
sb.magic		ok
sb.first_sector		8 [match]
sb.csum			11E99ECE7A83EABE [match]
sb.version		3 [cache device]

dev.label		(empty)
dev.uuid		55c95063-9aa7-4d2c-8c8c-d4d34d35a7ad
dev.sectors_per_block	1
dev.sectors_per_bucket	1024
dev.cache.first_sector	1024
dev.cache.cache_sectors	209714176
dev.cache.total_sectors	209715200
dev.cache.ordered	yes
dev.cache.discard	no
dev.cache.pos		0
dev.cache.replacement	0 [lru]

cset.uuid		2de3ccef-a7eb-4620-8b6d-265d0a06da17

# echo 2de3ccef-a7eb-4620-8b6d-265d0a06da17 > /sys/block/bcache0/bcache/attach

# bcache-super-show /dev/sdc
sb.magic		ok
sb.first_sector		8 [match]
sb.csum			11E99ECE7A83EABE [match]
sb.version		3 [cache device]

dev.label		(empty)
dev.uuid		55c95063-9aa7-4d2c-8c8c-d4d34d35a7ad
dev.sectors_per_block	1
dev.sectors_per_bucket	1024
dev.cache.first_sector	1024
dev.cache.cache_sectors	209714176
dev.cache.total_sectors	209715200
dev.cache.ordered	yes
dev.cache.discard	no
dev.cache.pos		0
dev.cache.replacement	0 [lru]

cset.uuid		2de3ccef-a7eb-4620-8b6d-265d0a06da17

# bcache-super-show /dev/sdb
sb.magic		ok
sb.first_sector		8 [match]
sb.csum			2E55F82F4131C19B [match]
sb.version		1 [backing device]

dev.label		(empty)
dev.uuid		cb10650f-cf60-4a96-81eb-7149ae650f94
dev.sectors_per_block	1
dev.sectors_per_bucket	1024
dev.data.first_sector	16
dev.data.cache_mode	0 [writethrough]
dev.data.cache_state	1 [clean]

cset.uuid		2de3ccef-a7eb-4620-8b6d-265d0a06da17