Final year resubmissions and caps

I was averaging 63 for my degree and had 2:2 conditional offers for my master's. i was recently told that id have to resubmit my dissertation in the summer due to an assessment irregularity. This also means that my graduation ceremony will only be in january or february. Now would i be able to start my masters in september if i can get my transcripts before that or would i have to wait till after my ceremony, defer for a year? There is a possiblity that i might now be getting a third class degree as my dissertation is 40 credits and it also gets capped at 40. Would this mean my master's offers being revoked eventhough im averaging a 2:1 barring just one module? If yes then would i have to do some kind of foundation programme/degree so that i can satisfy the entry requirements for my master's?
Sorry i know theres a lot f questions up there

I think there are Masters degrees thag are not part of accreditation systems for architecture, i.e part 2. So perhaps OP is talking about Masters rather than the part 2 diploma. I'm never really sure why people do it as it is not accredited so where will it get them? My thought to OP is will he stand much chance with architecture employers with a 2:2 a masters on top may help but it may all be in vain. Consider perhaps whether you might be able to get a HND at 2:1 or even first equivalent as it will take in first year marks (assuming there decent). A better grade HND may do more for you. Knock the final year off your CV. Then look at other ways of moving forward.

Stewie you're right, in that there are non-accredited Masters courses (although technically there are no accredited Masters courses because part II courses are only 120 credits at Masters level rather than 180 credits - this is a relic of the grant funding structure before full fees) however most Universities have relaxed the title rather than calling their Part II courses ProfDips or similar. Taught Masters courses offer specialisms, so I imagine people do them for that reason, although it maybe leads to a career in research rather than practice?

As for your other point, there is absolutely nothing wrong with a 2:2 degree. Before the League Tables started calling 2:1s "good degrees" it's what most people received (as degree classifications were distributed according to percentages rather than criterion, you were unlucky if you were in a talented year!) TBH, (apart from Universities) after your first job no one asks what degree classification you received because they are intested in your experience.

Way back in the day 2:2 was regarded as decent enough, but we're talking at least 15-20 years or more ago. Now, it's likely to be a killer to many a job application to an architecture practice a graduate would make. There I'd always the exception to the rule but it will be a hard task for many unless they have good contacts already. For sure after a short while in industry it's experience that counts and often applicants just put down degree without stating classification. To be honest I think it's all b*llocks, architecture courses of all variety poorly fit into the degree structure. A simply pass/fail would be better for everybody with a portfolio created being the focus in which the student pursues pushing their skills to the furtherest. There is such favouritism, bias, subjectivity, cheating, helping out by lecturer, parents/relatives/friends in practice that often any notion of classification being any relation to skill level us a joke.