Changing the mipmap strategy with mcmeta in a resource pack works, but only for mean. It seems this is not limited to resource packs because the default resources also look different for leaves for 1.21.10
This is best re-created by taking screenshots at the same position with packs that change the cutout strategy, as well as a screenshot for comparison on 1.21.10.
It would be expected that oak leaves using dark_cutout would match the 1.21.10 screenshot, and that the other 3 would all be distinct from each other.
It was observed that dark_cutout, cutout, and strict_cutout all look identical in the snapshot, and that none of the mipmap strategies match 1.21.10 for leaves.
I’ve also attached comparison images which isolate different pixels. Note how in the comparison image between cutout types, the leaves are identical, while the comparison to the mean strategy has different leaves.
Environment
Vanilla snapshot
Windows 11
Intel(R) Graphics 32.0.101.7026
from an Intel(R) Core(TM) Ultra 7 265U
Seemingly fixed in pre-2.