The Bug:
Players suffocate in ice when stuck inside of it.
Steps to Reproduce:
Summon a large block of ice and teleport inside it by using the commands provided below.
/fill ~1 ~ ~1 ~5 ~4 ~5 minecraft:ice
/tp @s ~3 ~1 ~3
Switch to survival mode and observe if you begin suffocating.
Observed Behavior:
Players suffocate in ice.
Expected Behavior:
Players would not suffocate in ice.
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Presumably the fact that it didn't occur in earlier versions, such as this screenshot from 1.3.1, and that ice being made to suffocate entities wasn't announced in any changelogs ?
[media]

See also the very similar MC-139394, which was swiftly considered a bug and then fixed.
Still affects 1.18.1-rc1, reopen

I can confirm this behavior. This also affects 1.19 and 1.19.1 Release Candidate 1.
[media]Can confirm in 1.19.1.
Can confirm in 1.19.2.
Where is the bug ?