Comment by tirant

This happened due to a change in regulation in Europe.

Some airports, like AMS or MUC, invested on new machines with higher detection capabilities, and decided to allow all liquids and improve efficiency in boarding. The EU updated the rules claiming those new machines were still not sufficient and airports should go back to forbidding liquids.

It was a mess. I remember flying from MUC and being allowed all liquids and on my return flight, also from EU, when trying to fly with a normal water bottle, security people looked at me wondering what the f I was doing: "Don't you know liquids are not allowed, sir!?"