I’m on a FP5 (stock OS, A15, VT2F.C.065) as well, just tested: Connected to my home WiFi, creating a WiFi hotspot does not turn off my WiFi/ does not remove the WiFi symbol.
Can confirm this. It’s the same with my FP3: when Hotspot is chosen, the phone switches to LTE. When Hotspot is turned off, it switches (after a short delay) back to WLAN.