How to reproduce
/place template village/savanna/houses/savanna_medium_house_2
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It's actually savanna_medium_house_2.
My bad

Looks fixed to me in 20w45a?
This isn't fixed in 20w45a as I can still reproduce this in 21w03a. It appears that only one door out of the two in this structure, is marked as open. I've attached a screenshot.
Can confirm in 21w07a.
Can confirm in 1.17.
Can confirm in 1.17.1.
Can confirm in 1.18.1.
Can confirm in 1.18.2 and 22w12a.
Can confirm in 1.19 and 1.19.1 Pre-release 1. This can now be more easily reproduced by using the "/place" command.
/place template minecraft:village/savanna/houses/savanna_medium_house_2
Can confirm in 1.19.2.
It's savanna_small_house_6