Liar's has been bugged since the arc rework. The cross counter doesnt trigger on being melee'ed if you have the new super, gathering storm equipped, and also doesnt trigger on a melee with the lethal current aspect equipped and active (eg. dodge to get melee, and activate lethal current, melee doesnt activate cross counter until the jolt goes away).
This has been bugged since the start of the season, and hasnt been mentioned or is in the known issues (no, today's hotfix did not fix it, the feedback fragment was not the issue. Tested in the conflux lost sector).
Its fine if its been hard to nail down and fix, but it would be nice to know bungo is working on it, or atleast knows about it.