it is still there on stable branch.
But for me only the first Slot gets deleted after respawn.

Hello JeggerTAP.
Did you have any weapons assigned to the quickbar slots which have been reset?
Regards,
Geez

i'm having this too. @Geez yes, and weird thing for me is icons of the wep which is in my hands, got disappears nothing else

I guess i know what is the cause of this Problem.

When you take the Primary weapon to your hands, it dissapears from the inventory (of course it reappears when you put it on your back).
So...after you respawn, the weapon is in your hands again, and the game doesn't detect the weapon in your inventory thats why it gets deleted from the hotbar.

It's the same when you drop an item on the floor which was previously placed on your hotbar (like morphine, Saline bag etc)gets deleted from it.

I prefer the previous inventory where clothes and weapon were in a specific order, and not this one where the latest piece of gear you pick up takes place on the bottom. that inventory was much easier to see through, and haven't had this problem. :D

The issue has been confirmed and scheduled for a fix.
Regards,
Geez

Hello JeggerTAP.
The issue has been fixed internally and should be fixed on Steam soon.
Regards,
Geez