Override fix for v12 rooms

[kegsay]

c.f element-hq/dendrite#3623

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.44%. Comparing base (d6bb4bd) to head (b7e0e08).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #458      +/-   ##
==========================================
+ Coverage   53.43%   53.44%   +0.01%     
==========================================
  Files          52       52              
  Lines        7823     7825       +2     
==========================================
+ Hits         4180     4182       +2     
  Misses       3239     3239              
  Partials      404      404              

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