Backport release/v6.4: fix to ProposalPOLMessage poisoning (CON-222)

[seidroid]

Backport of #3129 to release/v6.4.

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 31, 2026, 8:29 AM

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 30, 2026, 3:41 PM

[codecov]

Codecov Report

❌ Patch coverage is 59.22330% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.44%. Comparing base (20c6b86) to head (824ca93).
⚠️ Report is 1 commits behind head on release/v6.4.

Files with missing lines	Patch %	Lines
sei-tendermint/internal/consensus/state.go	33.33%	4 Missing and 4 partials ⚠️
sei-tendermint/types/vote_set.go	56.25%	5 Missing and 2 partials ⚠️
sei-tendermint/types/block.go	53.84%	3 Missing and 3 partials ⚠️
...tendermint/internal/consensus/types/round_state.go	33.33%	2 Missing and 2 partials ⚠️
sei-tendermint/types/validation.go	66.66%	2 Missing and 2 partials ⚠️
sei-tendermint/internal/evidence/verify.go	40.00%	1 Missing and 2 partials ⚠️
sei-tendermint/test/e2e/runner/evidence.go	0.00%	3 Missing ⚠️
sei-tendermint/types/evidence.go	57.14%	1 Missing and 2 partials ⚠️
sei-tendermint/types/part_set.go	33.33%	1 Missing and 1 partial ⚠️
sei-tendermint/node/setup.go	66.66%	0 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v6.4    #3139      +/-   ##
================================================
+ Coverage         58.43%   58.44%   +0.01%     
================================================
  Files              2088     2088              
  Lines            172060   172087      +27     
================================================
+ Hits             100537   100570      +33     
+ Misses            62569    62556      -13     
- Partials           8954     8961       +7     

Flag	Coverage Δ
sei-chain-pr	64.03% <59.22%> (?)
sei-db	70.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-ibc-go/testing/chain.go	93.98% <100.00%> (ø)
sei-tendermint/internal/consensus/msgs.go	81.60% <ø> (ø)
sei-tendermint/internal/consensus/peer_state.go	88.33% <100.00%> (+3.84%)	⬆️
sei-tendermint/internal/consensus/reactor.go	71.12% <100.00%> (+1.63%)	⬆️
...rmint/internal/consensus/types/peer_round_state.go	100.00% <ø> (ø)
sei-tendermint/internal/rpc/core/status.go	81.01% <100.00%> (ø)
sei-tendermint/types/proposal.go	85.71% <100.00%> (ø)
sei-tendermint/types/validator_set.go	93.10% <100.00%> (ø)
sei-tendermint/node/setup.go	67.03% <66.66%> (ø)
sei-wasmd/x/wasm/ibctesting/chain.go	68.22% <0.00%> (-0.32%)	⬇️
... and 9 more

... and 1 file with indirect coverage changes

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