Adding a Default Button block causes a newly added Expand / Show More to cause errors and not work properly

[andeng1106]

Describe the bug

• Connected with this issue: https://github.com/gambitph/Stackable/issues/2968
  • If I have both Default Text block & Default Button block, Expand block doesn't work properly anymore
  • Same assumption from the issue above: It seems to overwrite the custom attributes causing the Expand / Show More nested Button blocks to be empty
• Issue with styling also happens for the nested button blocks
• These errors show in console:

To Reproduce Steps to reproduce the behavior:

1. Add a Default Button block
2. Add a new page
3. Add a new Expand / Show More block
4. Save page and view frontend
5. See console for errors

Expected behavior

• Custom attributes for Expand / Show More block should not be overwritten if there's a Default Text or Button block

Screenshots

https://github.com/user-attachments/assets/1e01550b-30d1-46d5-83d8-92f2d529a6c0