When adding a Issue collector, this HTML code is generated:
<script type="text/javascript" src="https://****.atlassian.net/s/***-T/en_USqj4plq/6327/33/1.4.11/_/download/batch/com.atlassian.jira.collector.plugin.jira-issue-collector-plugin:issuecollector/com.atlassian.jira.collector.plugin.jira-issue-collector-plugin:issuecollector.js?locale=en-US?collectorId=******"></script>

domain.tld?foo=1?bar=2 is an incorrect format; it has to be foo=1&bar=2.