"from ROOT import *" now causes a crash

As it should. In release 25.2.22, or whatever version of root that corresponds to. Will fix in a bit, making the issue here to track.

xAOD::Init                INFO    Environment initialised for data access
Traceback (most recent call last):
  File "/home/callum/projects/ctb-stelzer/callum/HWWAnalysis/HWWAnalysisCode/CAFCore/QFramework/share/tqmerge", line 132, in <module>
    from ROOT import *
  File "/cvmfs/atlas.cern.ch/repo/sw/software/25.2/AnalysisBaseExternals/25.2.22/InstallArea/x86_64-el9-gcc13-opt/lib/ROOT/__init__.py", line 59, in __getitem__
    raise ImportError(textwrap.dedent(message))
ImportError: 
Wildcard import e.g. `from module import *` is bad practice, so it is disallowed in ROOT. Please import explicitly.