Works as intended on my SRV(I am also at darwin's legacy)
Suggested possible reasons :
1. you are mistaken
2. you are in Beta
3. you redeployed another SRV, not the one you damaged
4. it was a one off glitch
5. you were looking at the fuel not the hull
6. there is a threshold beyond which we don't get free repairs as my test was with an SRV at 94% (not as low as your test)
7. you might need to deploy and then back to ship to kick start free repairs
Ok....
1. Possibly...but I did a repair so...
2. Nope....never got chance to fire up the beta. No time....BP and all

3. I only deployed the 2nd Srv that one time I was nearly out of fuel and didn't have any fuel mats....that'd be back at WP 2 or so. Besides, what difference would it make? The SRV is either 100% or it isn't. If it isn't, it wasn't repaired.
4. Mmmmm.....testing required then
5. I don't think the fuel has a % symbol next to it.....I just realised there's probably a play tv video I look through if I get a chance.
6. Ooh.....that's an interesting twist

I once accidentally dropped most of my iron and nickel thinking I didn't need them, only to have near constant hull abrasion to the point I ran out off repairs and had to use the ship. Iirc I was below 50% then and it worked...So it must've changed in one of the updates.
7. Didn't try that
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I'm also quite sure that the SRV bay only does repairs if it's turned on when you load a damaged SRV into it. This should be less confusing in 2.1 where the SRV won't deploy unless the bay is powered up.
CMDR Andrew Reid
That's worth trying.....mine are definitely powered off. The repairs would still happen in the past, but maybe that changed in one of the patches. Another thing to test...
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Fwiw I logged a bug report for the inconsistent ship hull.