Saving an attribute with backend_type 'static' will remove the content of the 'frontend_class' field.

[MLucaciu]

Preconditions (*)

1. Magento Open Source 2.3.3

Steps to reproduce (*)

1. Navigate to Stores > Attributes > Product
2. Click an attribute with backend_type = static. Example: sku or category_ids
3. On the attribute edit page, you can either modify some fields or not modify any field at all.
4. Click "Save and continue edit".

Expected result (*)

1.frontend_class should have the same value as before saving.
2.

Actual result (*)

1. frontend_class is NULL
2. 

[m2-assistant]

Hi @MLucaciu. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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• Information on your environment
• Steps to reproduce
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

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@MLucaciu do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

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[MLucaciu]

yes

[m2-assistant]

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[magento-engcom-team]

✅ Confirmed by @dmytro-ch
Thank you for verifying the issue. Based on the provided information internal tickets MC-31961 were created

Issue Available: @dmytro-ch, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[m2-assistant]

Hi @sergiy-v. Thank you for working on this issue.
Looks like this issue is already verified and confirmed. But if you want to validate it one more time, please, go though the following instruction:

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