Unable to use --provision option to build or run iOS apps

Environment

OSX: 10.15.4

Output of tns doctor:
✔ Getting NativeScript components versions information...
✔ Component nativescript has 6.7.4 version and is up to date.
✔ Component tns-core-modules has 6.5.2 version and is up to date.
✔ Component tns-ios has 6.5.1 version and is up to date.
✔ Xcode is installed and is configured properly.
✔ xcodeproj is installed and is configured properly.
✔ CocoaPods are installed.
✔ CocoaPods update is not required.
✔ CocoaPods are configured properly.
✔ Your current CocoaPods version is newer than 1.0.0.
✔ Python installed and configured correctly.
✔ The Python 'six' package is found.
✔ Xcode version 11.5.0 satisfies minimum required version 10.

Not interested in Android in this project, so Android bits are not configured

Describe the bug

I am unable to run or build the app.

I can build the prepared app using XCode (once I fix the signing configuration, another potential issue with prepare command)

When trying to list available provisioning profiles:

tns <run|build|provision> ios --provision

Results in the not so friendly:

Expected """ or [^'"'] but "'" found.

When I run the command with the logging level increased:

tns <run|build|provision> ios --provision --log trace

I get the more useful:

...
Current CLI version:  6.7.4
Project dir from hooksArgs is: undefined.
Hooks directories: [ '/Users/j/Projects/visionlab/sad-dev/hooks' ]
BeforeHookName for command resolveCommand is before-resolveCommand
Project dir from hooksArgs is: undefined.
Hooks directories: [ '/Users/j/Projects/visionlab/sad-dev/hooks' ]
AfterHookName for command resolveCommand is after-resolveCommand
Validate options for platform: iOS
SyntaxError: Expected "\"" or [^'"'] but "'" found.
    at peg$buildStructuredError (/usr/local/lib/node_modules/nativescript/node_modules/ios-mobileprovision-finder/parsers/security-find-identity.js:314:12)
    at Object.peg$parse [as parse] (/usr/local/lib/node_modules/nativescript/node_modules/ios-mobileprovision-finder/parsers/security-find-identity.js:999:11)
    at Object.read (/usr/local/lib/node_modules/nativescript/node_modules/ios-mobileprovision-finder/index.ts:243:43)
    at IOSProvisionService.<anonymous> (/usr/local/lib/node_modules/nativescript/lib/services/ios-provision-service.js:80:55)
...

I tried to checkout what was going on above but it's complicated. I think it fails when trying to parse provisioning profiles.

Sadly the same error occurs when I try to supply a provisioning profile:

tns run ios --provision <UUID or Name>

Same thing happens on a newly created app.

Trying to run the app with no provisioning profile supplied in the command line fails with a signing error (regardless of the PROVISIONING_PROFILE or DEVELOPMENT_TEAM) being set in app/App_Resources/build.xcconfig but that's probably another issue.

To Reproduce

tns create sad-dev
cd sad-dev
tns run ios --provision

Expected behavior

A list of provisioning profiles

Additional context

I am running on Catalina. All seemed to work before I updated the OS. But sadly other stuff changed as well: NS version, etc...

Reproduziere das Problem mit tns create sad-dev und anschließend tns run ios --provision in der gemeldeten Umgebung. Beginne mit ios-provision-service.js und dem Parser ios-mobileprovision-finder, insbesondere mit parsers/security-find-identity.js, wo der Trace zeigt, dass das Parsen fehlschlägt. Als erledigt gilt die Aufgabe, wenn Provisioning-Profile aufgelistet und ein bereitgestelltes Profil ohne den gemeldeten Syntaxfehler verwendet werden können.