Steps to reproduce

1. In JIRA, create a filter using the plus sign in the JQL (e.g. text ~ "A+B")
2. Export > XML and copy the URL of this XML
3. In Confluence, insert a JIRA macro. Paste the JIRA XML link as its source

Expected result

Confluence issues a JIRA search for text "A+B"

Actual result

Confluence issues a JIRA search for text "A B". Looks like the %2B in the URL is being decoded by Confluence to a whitespace instead of a + sign. This can be problematic if the user wants to search for the literal + character.

Interestingly this seems to be the opposite scenario of CONF-32319.