I'm having the exact same issue. I tried to force a re-download of the streamed packages and to clear the WASM folder, as suggested above, and this did not resolve my issue. I actually went back to MSFS 2020 to see if I was doing something wrong, and the Blue system pressurized without issue in the prior simulator. If you could provide alternative suggestions to resolve this issue that would great, as I'd love to take the A310 out for a spin in MSFS 2024 with all systems functional! Thanks, IniBuilds--you guys are the best, and I'm sure there will be a quick resolution to this issue.
Best,
Jon