Running Jest --coverage with frontend-maven-plugin resutls in empty coverage info - maven

Question

I've set up my package.json to run jest with coverage :
"scripts": {
"sonar": "node sonar-project.js",
"test": "jest --coverage",
"test-analyze": "npm run test && npm run sonar"
},
running npm test will ouput correct lcov.info and lcov-report in HTML format. Standard ouput looks like:
C:\sandbox2\frontend>npm test
> sandbox2-front#0.0.1 test C:\sandbox2\frontend
> jest --coverage
PASS test/Converter.spec.ts
√ Test celsius to Fahrentheit (3 ms)
√ kelvinToCelcius
--------------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
--------------|---------|----------|---------|---------|-------------------
All files | 89.66 | 66.67 | 66.67 | 89.66 |
Converter.ts | 89.66 | 66.67 | 66.67 | 89.66 | 21,28-29
--------------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests: 2 passed, 2 total
Snapshots: 0 total
Time: 0.858 s, estimated 1 s
Ran all test suites.
I'm running the (supposedly) same command through Maven with frontend-maven-plugin, with the ad hoc configuration in my pom.xml:
<plugin>
<groupId>com.github.eirslett</groupId>
<artifactId>frontend-maven-plugin</artifactId>
<configuration>
<workingDirectory>.</workingDirectory>
<installDirectory>target</installDirectory>
<npmRegistryURL>https://ci.knowesia.com/npmjs/</npmRegistryURL>
<nodeVersion>${node.version}</nodeVersion>
</configuration>
<execution>
<id>npm-test</id>
<goals>
<goal>npm</goal>
</goals>
<phase>test</phase>
<configuration>
<arguments>run test</arguments>
</configuration>
</execution>
Despite everything looks fine, in the end my coverage reports (lcov.info, converage-final.json) are regenerated but empty.
This can be seen from standard output (you'll notice that no coverage info is displayed here):
[INFO] Running 'npm test --registry=https://internalciurl/npmjs/' in C:\sandbox2\frontend
[INFO]
[INFO] > sandbox2-front#0.0.1 test C:\sandbox2\frontend
[INFO] > jest --coverage
[INFO]
[INFO] PASS test/Converter.spec.ts
[INFO] â?? Test celsius to Fahrentheit (3 ms)
[INFO] â?? kelvinToCelcius
[INFO]
[INFO] ----------|---------|----------|---------|---------|-------------------
[INFO] File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
[INFO] ----------|---------|----------|---------|---------|-------------------
[INFO] All files | 0 | 0 | 0 | 0 |
[INFO] ----------|---------|----------|---------|---------|-------------------
[INFO] Test Suites: 1 passed, 1 total
[INFO] Tests: 2 passed, 2 total
[INFO] Snapshots: 0 total
[INFO] Time: 0.94 s, estimated 1 s
[INFO] Ran all test suites.
Are there any specific configuration to do? Is it an issue in the frontend-maven-plugin?