A recent commit ([1]) broke the big-bang build by moving the addition of the testsuite-feature-pack-preview module to a profile. The profile is on by default, but the move had the effect of changing at what point in the build it gets built (at least in some builds), to a point after the testsuite modules that use it. Breaks things, e.g. [2].
[1] https://github.com/wildfly/wildfly/pull/15826/commits/2855116551abfcccc9085a1c26498397562d981c

[2] https://ci.wildfly.org/viewLog.html?tab=buildLog&logTab=tree&filter=debug&expand=all&buildId=316746&_focus=37452