I encountered 2 bugs tied to one another.
The first one while I was trying to get down a ladder I got stuck in the mesh. I could not take any action and just had to wait till I got killed.
After I respawned I got back to the fight and noticed I could not use the shield and I thought it was the usual bug where a skill cannot be used even if it were available.
Instead the shield could technically be used, in fact it was in front of my character even though invisible.
I could run and shoot without having to hold it, the only thing I could not do was put it away and use cover while it was out.
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