Warning: Undefined array key "#langcode"

Thank you.

#langcode is always defined for the entire ecosystem here:
https://git.drupalcode.org/project/blazy/-/blob/8.x-2.17/src/Plugin/Fiel...

Please paste the entire warning message so I can see what is calling it?

Also may I know Blazy sub-modules and their versions you use if any?

They must be the latest release with the same date. I intentionally release them in the same date to avoid potential issues like this.

If you are overriding that method, be sure to update.
If using obsolete modules like Lory, etc., then they were no longer supported.

Regarding your patch, I am not sure your proposed solution would actually address the OP issue. References would not fix undefined key warnings.

Housekeeping for 2.18.

Feel free to re-open if still an issue.
Thank you.

Automatically closed - issue fixed for 2 weeks with no activity.