Hi, Should not be the 48 be the one talking to the company to get it fixed. I have seen few posts, people are having hard time in running 5G on their phones. I have reported this problem to the Google team but 48 team need to officially talk to them ...
I recently move to 48 from eir, on eir it was showing 5G on the same phone while after moving, it is still using the LTE band for 48, i have checked in the settings. Also, i did have the Samsung A54 5G, on that phone, the same sim is showing 5G.