If you have Minecraft menu - Video - Hide Hand to "enabled", and in-game if you do F1 to see everything without middle cross/inventory/names, and do it again, your hand will reappear on the screen, forcing player to disable it manually.

Specs :
CPU : Intel® Core™ i9-9900K CPU @ 3.60Ghz 3.60 GhZ
GPU : NVIDIA GeForce RTX 2080 Ti : Turing - 76T - Boost 1545 MHz - 11GB GDDR6 - Memory Speed 14 Gbps
RAM : 64 Go
Screen : Alienware 25" - DP/HDMI - IPS - 240Hz
(all drivers up to date)