Bad luck mate and well played.
Just a question does your indicator stalk have any play or ever-so-slightly drops in positions it may be the little spring tension in the contacts? Or crud in there? Common I believe.
If you need to replace it spring yourself a genuine one. I may have the genuine Lucas part number around if you want me to look for it and its cheaper to buy it as a Lucas preplacement part than a Genuine Land Rover packaged Lucas Part. I went the Genuine Lucas from England and it saved me heaps.
A test lamp with a sound function is going to help you find what’s wrong fast.
Something else I worked out was the Land Rover harness plugs come apart much easier if you warm them up with a heat gun. Learnt this the hard way after breaking some pins.
The fact that you can get it to work by bypassing the stalk I think the wet was just a coincidence.
Mate there are others here that know the sparks better than me I'm sure they will chime in here soon.
If you want to have a giggle price that Land Rover hazard switch.
Cheers Phil