WSO2 APIM 4.0 : The requested resource is not available

I have a published working API on the API manager and I made some changes in the API code in the integration studio then exported a CAR file.

After that I have deployed the car file of my API in the micro integrator 7.1.0 and restarted the micro integrator then make save and deploy in the API manager to publish a new version of the API (usually this works with no issues, and I have done this several times)

The API Endpoint configuration is load balanced on two service urls as follows:

http://10.10.10.1:8290/demo-api/

http://10.10.10.2:8290/demo-api/

when invoking curl in the backend server (micro integrator) it works just fine and return result:

curl -X GET http://10.10.10.1:8290/demo-api/getCountriesLookup

but when calling the API through the API manager as follows:

curl -X GET https://am.mydomain:443/demo/1.0.0/getCountriesLookup

I get the following response :

{
    "code": "404",
    "type": "Status report",
    "message": "Not Found",
    "description": "The requested resource is not available."
}

When viewing the API manager logs I see the following exception :

TID: [-1] [] [2022-12-14 10:53:40,921]  INFO {org.apache.synapse.transport.passthru.SourceHandler} - Writer null when calling informWriterError
TID: [-1234] [] [2022-12-14 10:53:41,129]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - STATUS = Message dispatched to the main sequence. Invalid URL., RESOURCE = /demo/1.0.0/getCountriesLookup, HEALTH CHECK URL = /demo/1.0.0/getCountriesLookup
TID: [-1] [] [2022-12-14 10:53:42,270] ERROR {org.apache.synapse.transport.passthru.SourceHandler} - HttpException occurred org.apache.http.ProtocolException: Invalid request line: GET /
        at org.apache.http.impl.nio.codecs.AbstractMessageParser.parse(AbstractMessageParser.java:209)
        at org.apache.synapse.transport.http.conn.LoggingNHttpServerConnection$LoggingNHttpMessageParser.parse(LoggingNHttpServerConnection.java:410)
        at org.apache.synapse.transport.http.conn.LoggingNHttpServerConnection$LoggingNHttpMessageParser.parse(LoggingNHttpServerConnection.java:384)
        at org.apache.http.impl.nio.DefaultNHttpServerConnection.consumeInput(DefaultNHttpServerConnection.java:262)
        at org.apache.synapse.transport.http.conn.LoggingNHttpServerConnection.consumeInput(LoggingNHttpServerConnection.java:114)
        at org.apache.synapse.transport.passthru.ServerIODispatch.onInputReady(ServerIODispatch.java:82)
        at org.apache.synapse.transport.passthru.ServerIODispatch.onInputReady(ServerIODispatch.java:39)
        at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:114)
        at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:162)
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:337)
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315)
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:276)
        at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
        at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:591)
        at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: org.apache.http.ParseException: Invalid request line: GET /
        at org.apache.http.message.BasicLineParser.parseRequestLine(BasicLineParser.java:302)
        at org.apache.http.impl.nio.codecs.DefaultHttpRequestParser.createMessage(DefaultHttpRequestParser.java:117)
        at org.apache.http.impl.nio.codecs.DefaultHttpRequestParser.createMessage(DefaultHttpRequestParser.java:50)
        at org.apache.http.impl.nio.codecs.AbstractMessageParser.parseHeadLine(AbstractMessageParser.java:156)
        at org.apache.http.impl.nio.codecs.AbstractMessageParser.parse(AbstractMessageParser.java:207)
        ... 14 more

NOTE : the API Manager logs mentioned RESOURCE = /demo/1.0.0/getCountriesLookup instead of RESOURCE = /demo-api/1.0.0/getCountriesLookup I don't know why ? where did this context comes from ?

UPDATE : added API endpoint configuration screenshot

Update 2 : The URL I get in the try out console in the API Manager

curl -X 'GET' \'https://am.mydomain:443/demo/1.0.0/getCountriesLookup' \
  -H 'accept: */*' \

I resolved the issue by deleting the API from the API manager and creating it again.