I am using Forge version 1.16.5 and the mod in its latest version 5.4.51.

I cannot skip the warning message informing me that upgrading from 5.3.2 to a higher version will delete my bags.
I want to specify that I have never launched a save with the mod before; I am on a fresh installation
Reproducing the bug is quite simple; just launch the game in version 1.16.5 with the mod.

go to config folder -> open travelersbackpack-client (client config for tb i dont remember exact name but it should be something like that) -> set displayWarning to false