MS Graph Endpoint /v1.0/identity/conditionalAccess/policies not listing all policies

I'm trying to enumerate all conditional access policies via the MS Graph endpoint

[https://graph.microsoft.com/v1.0/identity/conditionalAccess/policies

Unfortunately, this only returns one entry, even though there are more:

PS C:\> $capurl = "https://graph.microsoft.com/v1.0/identity/conditionalAccess/policies"
PS C:\> $capolicies = Invoke-RestMethod -Method Get -UseBasicParsing -Uri "$capURL" -Headers $Headers
PS C:\> $capolicies.value


id               : b2068eb2-e213-43a3-8462-14cf15766450
displayName      : cap-block-foreign-logins
createdDateTime  : 2023-01-23T12:13:55.7574472Z
modifiedDateTime :
state            : enabledForReportingButNotEnforced
sessionControls  :
conditions       : @{userRiskLevels=System.Object[]; signInRiskLevels=System.Object[]; clientAppTypes=System.Object[]; servicePrincipalRiskLevels=System.Object[];
                   platforms=; devices=; clientApplications=; applications=; users=; locations=}
grantControls    : @{operator=OR; builtInControls=System.Object[]; customAuthenticationFactors=System.Object[]; termsOfUse=System.Object[]}

In the portal, I can see the following three policies:

It doesn't matter if I try this with a Global Admin or e.g. Security Reader assigned user...

Even if I filter for the actual displayName of one of the other policies, they are not returned:

PS C:\> $capURL ="https://graph.microsoft.com/v1.0/identity/conditionalAccess/policies?`$filter=displayName eq 'cap-test'"
PS C:\> $capolicies = Invoke-RestMethod -Method Get -UseBasicParsing -Uri "$capURL" -Headers $Headers
PS C:\> $capolicies.value
[ EMPTY RESULT HERE???]
PS C:\> $capURL ="https://graph.microsoft.com/v1.0/identity/conditionalAccess/policies?`$filter=displayName eq 'cap-block-foreign-logins'"
PS C:\> $capolicies = Invoke-RestMethod -Method Get -UseBasicParsing -Uri "$capURL" -Headers $Headers
PS C:\> $capolicies.value


id               : b2068eb2-e213-43a3-8462-14cf15766450
displayName      : cap-block-foreign-logins
createdDateTime  : 2023-01-23T12:13:55.7574472Z
modifiedDateTime :
state            : enabledForReportingButNotEnforced
sessionControls  :
conditions       : @{userRiskLevels=System.Object[]; signInRiskLevels=System.Object[]; clientAppTypes=System.Object[]; servicePrincipalRiskLevels=System.Object[];
                   platforms=; devices=; clientApplications=; applications=; users=; locations=}
grantControls    : @{operator=OR; builtInControls=System.Object[]; customAuthenticationFactors=System.Object[]; termsOfUse=System.Object[]}

I saw that other people already asked the same question but no solution was ever provided... Do I have to open a GitHub issue for this?