I repotted this aloe 2-3 months ago into a larger container. Did not
clean roots, just got a larger pot, 1/4 filled with soil, unbagged the
aloe, popped it in and filled in around the sides. It remained in the
same growing location and there has been plenty of new growth at the
crown since then.
After a while, I noticed the white patches on the older leaves. The new leaves aren't affected.

It is an indigenous South African species - I was told the name but I have forgotten it.

I doubt this is sunburn, has anyone else had this before?