Suppressing a custom rule works in VSCode, but not from the commandline

Steps to reproduce

Unzip this: PSScriptAnalyzer - Custom rule suppression error.zip

The ZIP contains:

• CustomRule.psm1
• PSScriptAnalyzerSettings.psd1
• Run Me.ps1
• Suppress Testing.ps1
• Errors.clixml
• log.txt

Execute Run Me.ps1

Expected behavior

No errors.

Actual behavior

VSCode

Working OK. Custom rule suppressed, no squigglies:

Commandline

Got these errors:

Invoke-ScriptAnalyzer : Suppression Message Attribute error at line 4 in Suppress Testing.ps1 : Cannot find any DiagnosticRecord with the Rule Suppression ID undefinedVar.
At C:\Data\PowerShell\Miscellaneous\Issues\PSScriptAnalyzer - Custom rule suppression error\Run Me.ps1:3 char:1
+ Invoke-ScriptAnalyzer `
+ ~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidArgument: (Microsoft.Windows.P…ric.RuleSuppression:RuleSuppression) [Invoke-ScriptAnalyzer], ArgumentException
+ FullyQualifiedErrorId : Suppression Message Attribute error at line 4 in Suppress Testing.ps1 : Cannot find any DiagnosticRecord with the Rule Suppression ID undefinedVar.,Microsoft.Windows.PowerShell.ScriptAnalyzer.Commands.InvokeScriptAnalyzerCommand

Invoke-ScriptAnalyzer : Suppression Message Attribute error at line 2 in Suppress Testing.ps1 : Cannot find any DiagnosticRecord with the Rule Suppression ID Var1.
At C:\Data\PowerShell\Miscellaneous\Issues\PSScriptAnalyzer - Custom rule suppression error\Run Me.ps1:3 char:1
+ Invoke-ScriptAnalyzer `
+ ~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidArgument: (Microsoft.Windows.P…ric.RuleSuppression:RuleSuppression) [Invoke-ScriptAnalyzer], ArgumentException
+ FullyQualifiedErrorId : Suppression Message Attribute error at line 2 in Suppress Testing.ps1 : Cannot find any DiagnosticRecord with the Rule Suppression ID Var1.,Microsoft.Windows.PowerShell.ScriptAnalyzer.Commands.InvokeScriptAnalyzerCommand

I exported the errors to Errors.clixml. This is in the attached ZIP.

I set the custom rule to log the DiagnoticRecord. The log contained the following:

20190918 11:13:58:1358 - DiagnosticRecord: 
Message              : Avoid using non-local variables.
Extent               : $Var1
RuleName             : CustomRule\Measure-AvoidNonLocalVar
Severity             : Warning
ScriptName           : 
ScriptPath           : 
RuleSuppressionID    : Var1
SuggestedCorrections :
20190918 11:13:58:1358 - RuleSuppressionID check for leading/trailing spaces: >Var1<
20190918 11:13:58:1358 - RuleSuppressionID check property type              : System.String
--------------------------------------------------
20190918 11:13:58:1358 - DiagnosticRecord: 
Message              : Avoid using non-local variables.
Extent               : $undefinedVar
RuleName             : CustomRule\Measure-AvoidNonLocalVar
Severity             : Warning
ScriptName           : 
ScriptPath           : 
RuleSuppressionID    : undefinedVar
SuggestedCorrections :
20190918 11:13:58:1358 - RuleSuppressionID check for leading/trailing spaces: >undefinedVar<
20190918 11:13:58:1358 - RuleSuppressionID check property type              : System.String

The above shows that DiagnosticRecord with the required RuleSuppressionID were available.

Environment data

> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.0.0-preview.3
PSEdition                      Core
GitCommitId                    7.0.0-preview.3
OS                             Microsoft Windows 10.0.18362
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0


> (Get-Module -ListAvailable PSScriptAnalyzer).Version | ForEach-Object { $_.ToString() }

1.18.3
1.18.2
1.18.1
1.18.0