.. which is why one uses something else to establish the fact of being on course prior to following the needle.
Years ago, I was doing some contract training work for SAA on the B732 and the sim presented a textbook false localiser for (if I recall correctly) Cape Town. It was easy to set the scene for the problem if crews were other than disciplined in their descent navigation - especially if the automatics were set for capture too early - confused a few chaps over the period - but only once on the basis of once bitten, twice shy.
Plenty of articles such as this one on the net -
https://flightsafety.org/asw-article...alizer-signal/