Better error message if admin route doesn't exist

[FYvwotschel]

Preconditions and environment

Magento version: 2.4.3-p2

Steps to reproduce

1. Go to the admin panel
2. Go to any URL that doesn't exist: localhost:8080/admin/idontexist
3. Error message is: Invalid security or form key. Please refresh the page.

Expected result

Error message should be: Route with ID 'idontexist' doesn't exist or Route with ID 'idontexist' does not have a subroute 'index/index'

Actual result

Invalid security or form key. Please refresh the page.

Additional information

No response

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @FYvw. Thank you for your report.
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[m2-assistant]

Hi @engcom-November. Thank you for working on this issue.
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[engcom-November]

Hi @FYvw ,
Thank you for reporting and collaboration. Verified the behavior on Magento 2.4-develop branch and is reproducible. Hence considering this as Feature request.