How to synchronize pull request updates made through different event listeners

Bitbucket Development
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1

In case of pull request updates made through different event listeners, how can we synchronize update of same field (e.g., reviewers)?

Code
First listener:

pullRequestService.update(
	new PullRequestUpdateRequest.Builder(pullRequest, pullRequest.getVersion())
	.title(pullRequest.getTitle())
	.reviewers(reviewers)
	.build()
);

Second listener:

pullRequestService.update(
	new PullRequestUpdateRequest.Builder(pullRequest, pullRequest.getVersion())
	.title(pullRequest.getTitle())
	.reviewers(reviewers)
	.build()
);

Actual result
First listener:
image
Second listener:
image
Notice same update timestamp.

Thanks in advance.
Cheers.