fix: error message in PublicState::read

[shuklaayush]

Fix misleading error message

Checklist:

Remove the checklist to signal you've completed it. Enable auto-merge if the PR is ready to merge.

• If the pull request requires a cryptography review (e.g. cryptographic algorithm implementations) I have added the 'crypto' tag.
• I have reviewed my diff in github, line by line and removed unexpected formatting changes, testing logs, or commented-out code.
• Every change is related to the PR description.
• I have linked this pull request to relevant issues (if any exist).

[Maddiaa0]

thank you for doing this!! ( not closing change ; replacing with: #4149, for some reason applying this to HEAD is getting rejected )