This happens in v3.2.0 and 3.0.2, haven't tested other versions
When I'm viewing channels in tombstone mode with flexi on, normally there is a vertical separator between channels that are not sequential. This break goes away if the first channel is a multicell channel.
eg: Patch channels 1 and 6, flexi patched channels in live, there will be a break between channel 1 and 6 (as expected), but if 1 is a multicell channel there will be no break (not as expected)
No multicell - break:
Multicell - no break: