[Replace]Replacing with combination of text and simple header leads to failed exchange

[Hooghof]

Test case
Instance: development
Tenant: Regression Tests
Flow: WcgReplace

Replacing the regex \<Aggregated\>|\<\/Aggregated\> with ErikTest_${header.eriktest} leads do this error in version 15: java.lang.IllegalArgumentException: named capturing group is missing trailing '}'

If you replace with ${header.eriktest} it works as expected (version 16).

Same example is on acceptance, same tenant and flow name.

WCG: https://dovetailworld.atlassian.net/browse/DOV-2171