fix: fix serialization issues

[mcollovati]

Description

Fixes serialization issues

Fixes #436 Fixes #437

Type of change

• [x] Bugfix
• [ ] Feature

Checklist

• [x] I have read the contribution guide: https://vaadin.com/docs/latest/guide/contributing/overview/
• [x] I have added a description following the guideline.
• [x] The issue is created in the corresponding repository and I have referenced it.
• [x] I have added tests to ensure my change is effective and works as intended.
• [x] New and existing tests are passing locally with my change.
• [ ] I have performed self-review and corrected misspellings.

Additional for Feature type of change

• [ ] Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[vaadin-bot]

Hi @mcollovati and @caalador, when i performed cherry-pick to this commit to 11.3, i have encountered the following issue. Can you take a look and pick it manually? Error Message: Error: Command failed: git cherry-pick 747554982962b12115250d29ffc6937ca29b9aac error: could not apply 7475549... fix: fix serialization issues (#438) hint: After resolving the conflicts, mark them with hint: "git add/rm ", then run hint: "git cherry-pick --continue". hint: You can instead skip this commit with "git cherry-pick --skip". hint: To abort and get back to the state before "git cherry-pick", hint: run "git cherry-pick --abort".

[vaadin-bot]

Hi @mcollovati and @caalador, when i performed cherry-pick to this commit to 14.1, i have encountered the following issue. Can you take a look and pick it manually? Error Message: Error: Command failed: git cherry-pick 747554982962b12115250d29ffc6937ca29b9aac error: could not apply 7475549... fix: fix serialization issues (#438) hint: After resolving the conflicts, mark them with hint: "git add/rm ", then run hint: "git cherry-pick --continue". hint: You can instead skip this commit with "git cherry-pick --skip". hint: To abort and get back to the state before "git cherry-pick", hint: run "git cherry-pick --abort".