AFAIR btrfs and snapshots on the block device layer do not work together. lvs reports tpool_tdata_rimage_0 as being private (thus libstorage does not add it to the devicegraph). Also nothing else should be using it. But btrfs reports the filesystem on /dev/mapper/vg_b-tpool_tdata_rimage_1. In the good logs btrfs reports to use /dev/mapper/vg_b-tv_02 (maybe due to the filesystem being mounted). So at first sight it looks like a problem with btrfs.