MacBook Pro M4 not detecting external screens via Maxor Thunderbolt 3 cables

I have now updated to macOS 15.5. still the same outcome. When will @apple resolve this? Buying a high end machine, we shouldn't have to deal with this.

The M2 and M3 chips worked perfectly well with two screens.(same cabling)

Dell 3221QSA screen - Display port to Macbrook Pro 16" M4 Thunderbolt (Type-C) port utilising the cable above. As mentioned, this worked seamlessly with both the Macbook Pro 16 M2/M3 chips.

In order for both the ports to work at the same time e.g 2 screens, the laptop has to be restarted, but when changing between home and office setups(same screen and cables) only one port works. Using function to detect displays does nothing.

just to add to avoid confusion, there is no dock. it is direct cable from screen to mac.