Typing an equal sign in the Value fields of Headers and Extension properties shows "Property <value> is not a FEEL expression" but disappears after further characters are typed

[vasil-mo]

Describe the bug

When typing an equal sign in the Value fields of both Headers and Extension properties of Activities, there is an error shown that this isn't a valid FEEL expression. If you continue typing - the error disappears, which might lead one to believe that this is now a valid FEEL expression. Instead it is interpreted as a String by the process engine (as per documentation).

Steps to reproduce

1. Create a Header / Extension property
2. type an equal sign ("=") as the first character in the Value field
3. continue typing

Expected behavior

typing an equal sign ("=") should not show the "Property is not a FEEL expression" validation message or alternatively it should show the validation message continuously and not disappear after typing further characters.

Environment

• OS: MacOS 14.4
• Camunda Modeler Version: 5.18 but it also applies to the current verison (06.05.2024) in the Web Modeler
• Execution Platform: Camunda 8

Additional context

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Depends on camunda/bpmnlint-plugin-camunda-compat#53

[nikku]

I can reproduce the issue.

The header value is a static field and shall not be validated; we cannot assume any specific use of the value, unless we know the domain in which it is interpreted, i.e. Camunda 8 connectors.

[nikku]

This is a known issue; we positively assume that stuff starting with = as a FEEL expression.