Yep, for the EU Driver’s hours rules breaks interrupt periods of driving, so you cannot have a break that counts toward your 45 minutes until you have driven.
Solution to your problem is while doing the vehicle checks just move the truck forward a few feet, so you can check the bits of the tyres it was sitting on, and then do what you were doing. Just look at the mode display and as soon as that changes to the wheel symbol you have driven far enough. That will record a minute of driving and your 15 minutes will now count as a break from driving.