I’m surprised you needed a new battery so soon as this system is still quite new. It sounds like the charging logic within the logic board is having problems. To diagnose further you really need a in-line power meter to place in between your charger and system so you can see the voltages of the system and charger handshake. Here’s one I like [https://www.amazon.com/ChargerLAB-Power-Z-Portable-Supports-Chargers/dp/B0C9Q3RT7Z/ref=asc_df_B0C9Q3RT7Z?|Power-Z C240 Portable USB-C Tester, Digital Power Meter, Supports up to 240W and PD3.1 QC5.0, for USB-C]
If the charging logic within the logic board is bad you’ll need to find someone with the deeper skills to repair the board and sadly you didn’t need to get a new battery.