Liquid bag rule is also the rule in the USA, it's just the TSA and related agencies have long stopped enforcing it, and overtly say it's ok for the bag to be in cabin baggage. It should be pointed out that separating out risk items will allow a faster scan of baggage - the Global Entry approach is quicker for the passenger, slower for the TSA. Just think, when packing, "is this set of wires and liquid cannisters going to look baaad when scanned?".

This is - in theory - a short term problem in the UK until the CT scanners get rolled out allegedly June 2024, and other airports in the UK are rolling them out. Airports on CT scanners won't have any significant rules on liquids or their placement. Most European countries are also rolling them out but they are probably a year or so more away from getting rid of legacy systems and liquid rules, AMS being there already. LHR has them and at T5 you may encounter the CT scanners in Flight Connections. USA isn't going much faster, I noticed precisely 1 CT scanner in JFK T8, and it's kaput.

Best tip: Allow connections that should give you a clear 80 minutes plus until your next flight, then go via landside, particularly if you are Gold / AA Emerald (etc) so that you can go via the First Wing. On a consistency basis, I find it is the best security experience of any large airport anywhere in the world. If security hassles you, consider transferring at smaller airports instead, such as SNN or GLA.