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each company is different, from my experience it would depend on the severity of the fix, and the severity of the issue. the problem would get resolved by any means ie temporary sticky plaster if necessary.

Another team would then assess and analyse the root cause from a company wide perspective and then assess the risks, costs and impact and then make any modifications (possibly redoing the temporary fix, and fixing it properly)

Real issue, a call center main telephony system and one of the management servers kept crashing causing over 1400 call center people to stop working. Temporary fix was to re boot the servers every 4 hours causing minor pain, but the call staff was up and running.

After a whole stupid week of the engineers not being able to find the route cause it was escalated extremely high and our team was brought in and we found the root cause in seconds (literally)The servers was VMs and the engineers hadn't checked the physical ESX server they were hosted on. another VM on the box caused the server to go unstable (ESX not configured correctly).

BAU project set up to audit/ report and fix all the ESX servers in the company for other stupid config issues