Macbook Pro 2019 overheating with external monitor

**Problem** My Macbook overheats insanely. After investigating a bit, I found out that the correlation is extremely strong with having it plugged in to an external monitor with the Macbook Pro monitor also active. If I unplug the laptop, or use only the external monitor (i.e. Mac in a 'clamshell' mode), the heating stops within a minute. I managed to use a software (sudo powermetrics --samplers smc |grep -i "CPU die temperature") to measure this: * Indoor temperature: 23C * CPU heat without external monitor: 55C * CPU heat with external monitor + macbook monitor on: 95C (fan turns on) * CPU heat with external monitor, macbook closed: 62C **Details of hardware** - Macbook Pro (16-inch, 2019). 2.3 Ghz 8-Core Intel Core i9, 16 GB 2667 MHz DDR, AMD Radeon Pro 5500M 4GB, Intel UHD Graphics 630 1536 MB - macOS BigSur 11.4 - Monitor: HP E233. 23-inch (1920 x 1080) - Cables connecting: UGREEN USB C Hub HDMI USB C Adapter with 4K HDMI, 3 USB 3.0, SD/TF Card Reader (https://www.amazon.de/gp/product/B07RRPS5NT/) , and then a standard HDMI-cable **Tried fixes that didn't work** - Restart - SMC reset - Never use two monitors (works) **How could I fix this so I can use two monitors also in the future?**