My manual boot stanza originally contained a functional manual boot stanza containing the line volume "Arch Linux"
This lead to the creation of the override file named "arch linux_vmlinuz-linux.conf" and the line include btrfs-snapshot-stanzas/arch linux_vmlinuz-linux.conf
The space in the file name caused refind to not include the file and thus the generated manual boot stanza did not show up in the rEFInd menu.
I was able to resolve my issue by changing the volume name to "Arch" but refind-btrfs should probably make sue not to create file names unsupported by rEFInd.
My manual boot stanza originally contained a functional manual boot stanza containing the line
volume "Arch Linux"
This lead to the creation of the override file named "arch linux_vmlinuz-linux.conf" and the line
include btrfs-snapshot-stanzas/arch linux_vmlinuz-linux.conf
The space in the file name caused refind to not include the file and thus the generated manual boot stanza did not show up in the rEFInd menu.
I was able to resolve my issue by changing the volume name to "Arch" but refind-btrfs should probably make sue not to create file names unsupported by rEFInd.