Same thing happens to stealth bases. Reclaiming engineer will go out of their way to reclaim buildings they never saw.
Do engineers auto-find stealth & cloak (Selen) too easily?
Interesting I actually kinda forgot about this since I haven’t seen it in such a long time. I’m pretty sure this is a game engine thing but am curious if there’s a way to fix
It's an engine bug. The engineer that is looking for something to reclaim does not take into account the intel status
A work of art is never finished, merely abandoned
@jip
Would it be worth experimenting with making the 'cloak' buff, the one that gives selens reduced vision and radar range in XSL0101_script.lua , also modify its energy cost to something huge, like 20,000?
That way, the engineers would still 'go looking' for cloaked selens, but upon finding them, the engineer would just 'point them out' with the reclaim beam, rather than immediately exterminating them?
I'd think this change would be nicer than removing the 'hunting' functionality entirely, while still requiring a little more human involvement both in finding and destroying cloaked selens, and also in the counterplay (rescue the selen fast! 
)?
(My other suggestion would be to give the cloaked selen whatever commanders have that makes them impossible to reclaim, but I'm unsure what that is, and stopping engineers from seeking out selens at all might be 'too strong'. (Does anyone actually feel that Selens that needed omni or a physical bump would be 'too strong'?)
(ps. quote: "The engineer that is looking for something to reclaim does not take into account the intel status" - Well, they don't seek out units (including uncloaked selens) that aren't stealthed... So they kinda do take intel status into account! Not the way they should though, of course!)
selen functionally impossible to reclaim: you have now autowon half your games by putting 4 on random enemy mexes
needing a physical bump is too strong because it means engies have zero capacity to fight back against them, when there are still plenty of times an engie can reclaim a lab attacking it
@ftxcommando I suggested ONLY getting the energy boost while cloaked.
FWIW 'fight back' isn't the case here - if the selen tries to fight, it is uncloaked, and thus gets reclaimed almost immediately.
But if an energy cost of 'something huge' is bad, perhaps a middle ground? The value of the energy cost boost could be calibrated so that the engineer can reclaim a cloaked selen in whatever time is best for balance. I'm not convinced that "almost immediately" is best for balance, given that it makes selens complete junk compared to other scouts and LABs, without even requiring any player interaction to kill them... But I defer to your judgement, you know better than I!
UNcloaked selens, ie those fighting and such, would still be reclaimed almost immediately, as per current balance. Their energy cost (aka reclaim damage/second) would be unchanged.
The change I suggested ONLY effects cloaked selens getting reclaimed, and is a way to make it take longer.
Basically, what I imagined is that cloaked selens being reclaimed are 'pinned down', and need rescuing by friendly units before they get ground-fired by enemy offensive units. If you feel it's better than the reclaim beam actually kills them, then that's cool too - I just feel it should be a little longer than 'almost instantly' as it currently is.
@redx 
Don't worry - you don't get any energy while reclaiming wrecks - only mass.
You only get energy from reclaiming un-finished buildings.
(I believe that the buff is lost when the unit dies, too. Not that it matters here.)
@warning_potatopc Yes, I always feel that It's akin to aurora vs striker/mantis/thaam, except much 'closer to the wire'. I find that interaction very fun.
(Still, I don't understand these people that build 30 selens and hit the field with them!)