hid-gadget-test behaving strange

[d3r3lict]

MANUFACTURER: Xiaomi
DEVICE_NAME: Redmi Note 8 Pro
DEVICE_CODENAME: Begonia
MODEL_NUMBER: M1906G7G
SYSTEM_ON_CHIP_NAME: MediaTek Helio G90T (MT6785V/CC)
SYSTEM_ON_CHIP_CODENAME: MT6785
LINEAGEOS_LINUX_KERNEL_SRC: -
LINEAGEOS_LINUX_KERNEL_VERSION: -
MANUFACTURER_LINUX_KERNEL_SRC: https://github.com/MiCode/Xiaomi_Kernel_OpenSource/tree/begonia-r-oss (I'm NOT using it, I'm currently using PE kernel which supports HID)
PE KERNEL SOURCES: https://github.com/PixelExperience-Devices/kernel_xiaomi_begonia (I'm currently on A13)
MANUFACTURER_LINUX_KERNEL_VERSION: 4.14

Hey! I'm facing a very strange problem right now. I'm trying to send some keystrokes to my laptop using hid-gadget-test, and it says "Success", but actually nothing happens. When I'm trying to use hid-keyboard instead, I'm getting either "/dev/hidg0: There is no such file or directory" error or just nothing, like hid-keyboard is getting stuck until I stop it using CTRL+C. Note that /dev/hidg0 actually exists, and has chmod 777. I was trying to do the same on all the hid interfaces I have, but there is just no result. Any help appreciated 🙏