Rudder

Can't reproduce
You shouldn't be able to save a technique with a block without component name anyway, but I can't figure it out how you manage to do this.

Got a similar behaviour while creating a technique from scratch. I added a block and when I wanted to save I got a strange error, and then my technique could not be saved because another "shadow" one was taling its ID. I had to change its name, and when saving, I ended up with both techniques...
See the webapp logs below:

[2022-02-14 14:18:04+0000] INFO  policy.generation - [metrics] Xmx:1015 MB nodes:1 (cached:1) rules:4 (enabled:3) techniques:47 (enabled:47) directives:8 (enabled:8) groups:2 (dynamic:2) parameters:2
[2022-02-14 14:18:04+0000] ERROR com.normation.rudder.rest.RestUtils - "Could not create ncf technique <- An error occurred during technique update after files were created for ncf Technique Test bloc with report <- Unexpected: Accumulated: Error when automatically activating technique 'test_bloc_with_report'; cause was: Consistancy: Can not add a technique with id 'test_bloc_with_report' in user library. active technique 'activeTechniqueId=test_bloc_with_report,techniqueCategoryId=ncf_techniques,techniqueCategoryId=Active Techniques,ou=Rudder,cn=rudder-configuration}' is already defined with such a reference technique." 
[2022-02-14 14:18:04+0000] INFO  policy.generation - No node configuration was updated, no policies to write
[2022-02-14 14:18:04+0000] DEBUG explain_compliance - Updated node configuration ids: 
[2022-02-14 14:18:04+0000] INFO  policy.generation.timing - Timing summary:

[2022-02-14 14:18:05+0000] INFO  policy.generation.timing - Policy generation succeeded in:           
[2022-02-14 14:18:05+0000] INFO  policy.generation.manager - Successful policy update '5' [started 2022-02-14 14:18:04 - ended 2022-02-14 14:18:05]
[2022-02-14 14:18:30+0000] ERROR com.normation.rudder.rest.RestUtils - "Could not create ncf technique <- Technique name and ID must be unique. Name 'Test bloc with report' and ID 'test_bloc_with_report' already used, they are case insensitive" 
[2022-02-14 14:19:06+0000] ERROR com.normation.rudder.rest.RestUtils - "Could not create ncf technique <- Technique name and ID must be unique. Name 'Test bloc with report' and ID 'test_bloc_with_report' already used, they are case insensitive" 
[2022-02-14 14:19:15+0000] INFO  techniques.reader - Reloading technique library, found modified technique(s): ['test_bloc_with_report2': updated (1.0: added)]
[2022-02-14 14:19:15+0000] INFO  com.normation.rudder.services.policies.TechniqueAcceptationUpdater - Automatically adding technique 'test_bloc_with_report2' in category 'User Techniques (ncf_techniques)' of active techniques library
[2022-02-14 14:19:15+0000] INFO  com.normation.rudder.services.policies.DeployOnTechniqueCallback - Update Technique library after creating files for ncf Technique Test bloc with report2
[2022-02-14 14:19:15+0000] INFO  policy.generation - Start policy generation, checking updated rules
[2022-02-14 14:19:15+0000] INFO  policy.generation - [metrics] Xmx:1015 MB nodes:1 (cached:1) rules:4 (enabled:3) techniques:48 (enabled:48) directives:8 (enabled:8) groups:2 (dynamic:2) parameters:2
[2022-02-14 14:19:15+0000] INFO  policy.generation - No node configuration was updated, no policies to write
[2022-02-14 14:19:15+0000] DEBUG explain_compliance - Updated node configuration ids: