Tested with eoan-proposed (problem does not exist)
----

root@bionic-bcache:~# uname -rv
5.2.0-9-generic #10-Ubuntu SMP Sat Jul 20 14:05:52 UTC 2019

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[   54.032674] bcache: register_bdev() registered backing device loop0
[   54.036972] bcache: run_cache_set() invalidating existing data
[   54.051598] bcache: register_cache() registered cache device loop1
[   54.065354] bcache: register_bcache() error /dev/loop1: device already 
registered
[   58.038440] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 
cae17283-45ee-4aa1-9fb1-00ad889c02e5


# reboot
# # comment last line in script.

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[   28.140043] bcache: register_bdev() registered backing device loop0
[   41.927908] bcache: bcache_device_free() bcache0 stopped
[   77.142936] bcache: register_bdev() registered backing device loop0
[   77.160954] bcache: run_cache_set() invalidating existing data
[   77.172800] bcache: register_cache() registered cache device loop1
[   77.172886] bcache: register_bcache() error /dev/loop0: device already 
registered (emitting change event)

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https://bugs.launchpad.net/bugs/1837788

Title:
  bcache kernel warning when attaching device

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