[BUG] Multiselect attributes do not work

[miloszwielgus]

Describe the bug
While a user can create a multiselect attribute, selecting any of it's options while creating a product is not possible.

To Reproduce
Steps to reproduce the behavior:

1. Create a multiselect attribute with a few options
2. Go into product creation

Expected behavior
User can choose one or more attributes from the multiselect attribute.

Actual behavior
After clicking on any of the attributes options it gets highlighted, but as soon as user
clicks on a different option the highlighting disappears, the attribute option isn't selected/saved in any way.

Background (please complete the following information):

• NodeJS Version: 21.5.0
• ShopMost Version: 1.0.0
• OS: Manjaro Linux Kernel: 6.6.10-1-MANJARO
• Browser: Firefox