[MC-279124] Some Structures generate Vacuums

The corridors/open spaces in some (primarily older) structures don't generate filled with air blocks but seemingly no blocks at all (i.e. a vacuum).

Steps to Reproduce using the Mineshaft as an example

1. Find & enter the Structure

/locate structure minecraft:mineshaft

2. Check the supposed Air blocks in a Mineshaft corridor

# Using '/execute'
/execute if block ~ ~ ~ air

# Using '/fill'
/fill ~ ~ ~ ~ ~ ~ glass replace air

3. Receive an Error Message because no Air blocks were found

# Result of '/execute'
Test failed

# Result of '/fill'
No block were filled

4. Optional: Place any block at the target coordinates by hand, remove it & execute the command(s) from step 2 again to receive the expected result of Air blocks being detected

# Result of '/execute' after Block Update
Test passed

# Result of '/fill' after Block Update
Successfully filled 1 block(s)

See the attached videos for a demonstration.

Based on what I've tested, the game's oldest structures which haven't been (majorly) updated since seem to be affected. The bug has probably always been in the game, but I couldn't find an open bug report discussing it.

Affected Structures	Unaffected Structures
mineshaft mineshaft_mesa stronghold dungeon	fortress desert_pyramid jungle_pyramid swamp_hut trial_chambers