"No SIM Card" after flashing custom ROM (Oneplus 7 Pro)

I have an unlocked Oneplus 7 Pro that I just installed Havoc OS on, which stopped the SIM card from being recognized. This SIM card works on both other phones (stock Pixel 2) and this phone with a stock ROM. The phone still has its two IMEI numbers. I've looked at quite a few options to fix this, such as: - Rebooting the phone multiple times - Clearing Dalvik/Cache - Resetting all network settings in Settings > System > Reset options - Reflashing the ROM and TWRP multiple times to make sure they are in both slots - Trying dial codes \*#\*#72786#\*#\* and \*#\*#4636#\*#\* (both cleared the input but nothing happened afterwards, no menus or popups) - Taking out the sim, putting it in airplane mode, putting the sim back in, powering off, waiting a minute, and putting it back in - The device was sim unlocked before flashing the ROM