This issue is similar to MC-103934 but applies to salmon released from buckets rather than spawn eggs. Sometimes, a big salmon placed from a bucket suffocates.
How to reproduce
Spawn multiple salmon until you get a big one
Use a bucket to pick up a big salmon
Stand directly next to a block
Release the salmon inside yourself.
Expected result
The salmon would spawn without intersecting a block and would not suffocate.
Observed result
The salmon suffocates.
Can confirm.