'.' does not repeat last group action

[alexherbo2]

. repeats last change.

After typing <a-a>WD, D is repeatable in ..

map global normal R <a-a>WD

After typing R, <a-a>WD should be repeatable in ..

It concerns registers as well.

[mawww]

'.' does reproduce the last modification, not the preceding selection operation. A modification will be either an insertion, a deletion or a change.

[alexherbo2]

If you’ve ever tried using the . command after a map, you were likely
disappointed to discover it only repeated the last native command inside that
map, rather than the map as a whole. That disappointment ends today.
– Tim Pope end of verse

[CosineP]

i'd like this for <a-.>, which seems to not relate to your objection. today i tried to map t to Lt so that i could t<a-.><a-.>, but it doesn't work because <a-.> only repeats the final t