Any new custom object does not have Delete All Access rights generated.
In logs we see the errors:
WARN 2021-07-14 13:04:53,875 [http-nio-8080-exec-128] niku.union (clarity:admin:60094027__120BBEC0-44E2-4AA0-AAE0-8DE7BF140E0D:odf.createObjectSave) odf.custom.rightDeleteAllName was not found in file: messages_en.properties
WARN 2021-07-14 13:04:53,875 [http-nio-8080-exec-128] niku.union (clarity:admin:60094027__120BBEC0-44E2-4AA0-AAE0-8DE7BF140E0D:odf.createObjectSave) odf.custom.rightDeleteAllDescription was not found in file: messages_en.properties
WARN 2021-07-14 13:04:53,880 [http-nio-8080-exec-128] niku.union (clarity:admin:60094027__120BBEC0-44E2-4AA0-AAE0-8DE7BF140E0D:odf.createObjectSave) odf.custom.rightDeleteName was not found in file: messages_en.properties
WARN 2021-07-14 13:04:53,880 [http-nio-8080-exec-128] niku.union (clarity:admin:60094027__120BBEC0-44E2-4AA0-AAE0-8DE7BF140E0D:odf.createObjectSave) odf.custom.rightDeleteDescription was not found in file: messages_en.properties
Release : Any
The file messages_en.properties was customized and replaced from another environment.
This file contains the rights for the custom objects and the Delete rights is not there, this is why it isn't working.