Function's context's logger does not log to the log-topic

[YArane]

Describe the bug
When using the context's logger, log messages are not produced on the function's log topic.
Relevant docs: https://pulsar.apache.org/docs/en/functions-debug/#use-log-topic

To Reproduce
Steps to reproduce the behavior:

1. Create a Pulsar Function which logs a message using the context's logger (see LoggingFunction.java example below)
2. Deploy said function using pulsar-admin specifying a log-topic in the create command
3. Trigger the function / produce a message on one of its input topics
4. Log messages appear in the function's log file only

Expected behavior
Expected to see the log message produced on the function's log topic in addition to being printed to the log file.

Screenshots

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class LoggingFunction implements Function<String, Void> {
    @Override
    public void apply(String input, Context context) {
        Logger LOG = context.getLogger();
        Logger LOG2 = LoggerFactory.getLogger(this.getClass);
        LOG.info("This message appears in log file only")
        LOG2.info("This message appears in log file AND log topic")
    }
}

$ bin/pulsar-admin functions create \
  --log-topic persistent://public/default/logging-function-logs \
  # Other function configs

Desktop (please complete the following information):

• OS: iOS

Additional context
Pulsar 2.6.0 running in standalone mode (not in a docker container)

[zymap]

@jianyun8023 will handle this issue.

[jiazhai]

Thanks @freeznet for helping with this issue