Drowned sometimes fail to acquire player target in daytime when both are fully submerged in water (regression)

Environment:

Minecraft Java Edition 26.3‑snapshot‑9

Clean vanilla installation, NO mods, NO data packs, NO resource packs.

Works correctly in 26.2, broken starting from 26.3‑snapshot‑3.

Related ticket: MC‑309435 (claimed fixed in 26.3‑snapshot‑3, but this regression appears).

Steps to Reproduce:

1. Create a new single‑player survival world. Game difficulty set to Normal or Hard.

2. Run command: /time set day (full daytime).

3. Swim so the player is fully submerged underwater.

4. Run command: /summon minecraft:drowned ~ ~ ~

5. Observe the newly‑spawned drowned.

6. (High‑trigger case): Let drowned briefly touch 1‑block shallow water / waterlogged slab, then swim back into deep water.

Expected Results:

During daytime, when both player and drowned are fully in water, drowned should automatically aggro and chase the player. This is intended vanilla behaviour.

Observed Results:

Some drowned will NOT initiate aggression toward the player.

- Drowned will fight back normally if player hits them manually.

- F3 entity debug shows Target = 0 (no attack target assigned).

- Running `/execute as @e[type=minecraft:drowned] run entitydata @s {}` forces AI refresh, after that drowned will immediately target the player.

- This bug only occurs in daytime; at night drowned behaves correctly.

- Probabilistic issue, does not happen 100% of spawns.

Notes:

This regression was introduced by the fix for MC‑309435. The water‑state flag desync in target selector logic causes the hostile‑check condition to return false intermittently.