As pointed out by others, ACV doesn't equate to invoicing, cash or recognised revenue. Has anyone seen a 3DP contract in the wild? If not, here's my guess.
The ACV is the total of a bunch of components: features, user licences, storage, CPU use and bandwidth. ACV is the expected (or maximum) cost once the customer gets up to speed: all data loaded, all users set up, all features in use etc. It seems like this takes at least 12 months. Then (probably) the customer is invoiced in arrears (monthly or quarterly) and on 30-day terms and probably pay 45 days later. So there's a massive lag from ACV to cash. It’s a forward indicator.
What will be much more revealing is the recognised revenue in the annual report. They should be able to recognise revenue for services delivered, whether invoiced or not, so that's a real measure.
The other things that I'll look at closely are the aged debtors and doubtful debts. Are customer paying and how slowly? As interest rates rise, there's an incentive to delay payment so this should get worse. And public companies can make their cash flow statement look better by not paying their bills (assuming that they are able to pay).
Back to ACV - this can only be compared to itself, and this quarter showed good, albeit slowing, growth. Not surprised the SP has retreated a little.