At this phase in their life the clutch tube failures are pretty common.
This is so common with 914's. Prior owners attempt to fix but they only look at the symptom (the cracked bulkhead) and then slap a "fix" onto it. Meanwhile they never address the root cause (the broken clutch tube restraint) that is leading to all the flexing in the 1st place.
Nice job fixing the clutch tube at both ends! It will be good to go for decades!
Known more than a few 914's where the front support tab had long broken off which would cause the rear firewall to continue to break away.