After T243667: Cannot log in when username contains spaces in PHP 7.4: "wrong username or password", we should prevent PHP 7.4.2 from being used somehow... Because 7.4.2 is >= minimum (7.2.22), it's valid, but we know it's pretty broken...
It might be beneficial having some more generic way of doing this in MW as these bugs happen. We did previously have a PHP Bug Tester, but that was removed as all fixes were before out minimum version
Obviously when we bump our min PHP version to 7.4, we can set >= 7.4.3 (or higher), but in the meantime, MW pretends it's a workable version