deserialized endorsements fail signature verification in doctest

[Ben-PH]

Describe the bug
If one verifies the signature of the endorsements following the deserialization loop found in

src/export_active_block.rs - export_active_block::ExportActiveBlockDeserializer::deserialize (line 157)

the verifications fail.

To Reproduce

apply this diff to commit 65fcea9 then run cargo test -F testing -p massa_consensus_exports --doc

index f0e5bae6b..b20b3c4c3 100644
--- a/massa-models/src/block.rs
+++ b/massa-models/src/block.rs
@@ -771,6 +771,9 @@ impl Deserializer<BlockHeader> for BlockHeaderDeserializer {
             ),
         )
         .parse(rest)?;
+        for end in endorsements.iter() {
+            end.verify_signature().unwrap();
+        }
 
         Ok((
             rest,

Expected behavior

passing tests

Additional context

Discovered as part of work being done in #3364

[AurelienFT]

This is maybe similar to #3378 the creation of the endorsement is maybe wrong and doesn't old the right data to be a valid endorsement.

[Ben-PH]

This can better reveal the crux of the issue:

checkout deser-bug-demo branch
git checkout HEAD~1
cd into massa-consensus-export
cargo test --doc

see failure

git checkout deser-bug-demo
cargo test--doc

passes.

the commit that allows a pass is here

[AurelienFT]

Done in #3364