Custom entities are labeled as 'Unknown' in various messages

Please remember that the Beta is for trying out new features and finding the bugs in them, but the focus is on fixing those bugs in the release. Bugs can require a lot of work to fix, particularly in new and very complex code such as the custom entities. Bugs may not be fixed until the actual release, or the feature may even be postponed to the following release in some cases.

Note that this issue has been related or dupiculated by MCPE-38696. As the same result as this thread.

Windows 10 version 1.10.1 here. 

I have a similar issue. I have defined Entity.something:my_custom_entity.name of my custom entity. When I use /kill on my entity it actually displays as it should with proper name, but If I for example get killed by this entity then it displays as ‘player was slain by Unknown’

V 1.12.13 Boss bar also shows unknown as well as items mentioned above (container inventory and killed by message). only the /kill command shows the proper name.

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However, this issue has been temporarily closed as Awaiting Response

Is this still an issue in the latest version?

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yes this is still an issue

Yes, this is still an issue.

Resolved in 1.13.0.16

Death messages are now correct for regular custom mobs.

for Boss Bars, minecraft:boss component now contains a "name" parameter and it appears correctly on boss bar when set

@Zephira statement is true. This bug was fixed in v1.13.0.16/v1.13.0.17.

Wait, the game have bugs on Entity Container name, it still "Unknown" in the inventory screen name for custom entities, this isn't fully fixed.

This is still not fixed can somebody please look into this thanks!

Entities' names still render as Unknown in containers.

I can confirm this happens on Win10 1.14.0

Last I checked, boss bars work perfectly fine, although that was several months ago. I can say for sure that containers still say "Unknown," not sure about death messages.

Issue still unresolved for containers in custom entities unfortunately.

Still unresolved on all platforms as of 1.18.12. The issue appears to come from the inability to define or label custom runtime identifiers.

Still unresolved for 1.19.2 on Win10 edition... worst is it shows this:

Entity name was already defined in the text files.

And can confirm that it is working properly on majority of the parts.

Even /say command executed to be performed by the custom entity works fine.

15th of february,2023 bedrock version is 1.19.60 .

this bug ain't fixed. Pls mojang help. as a newcomer in behavior pack making it makes me thinks that it was my fault. pls help

Adding more context to this bug. 

Issue is still present. 

In relation to the Inventory component UI 'Unknown' issue. 

Upon the entity being spawned and inventory opened, the entitys name will be displayed as 'Unknown', all other instances of the entitys name will display correctly across the game, its just the Inventory UI.

Also to add, if you re-name the entity (if entity has nameable) the new entity name will display correctly in the inventory UI. 

Still got this issue with 1.21.2 please fix

From the previous comment from what Im experiencing this is not correct what I am experiencing is when my custom entity is tamed it still says unknown was killed 

Thank you for your report!

However, this issue has been temporarily closed as Awaiting Response.

Could you please attach an example addon showcasing the issue?

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Please reopen this issue. It has been a bug for years and several people are awaiting a fix. This is present in all versions of Bedrock.
I can confirm this exists in 1.21.51.