Ensure that once instantiated loading_indicator is disconnected from default

[philippjfr]

Fixes #6306

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d35ad7a) 82.65% compared to head (c89ea50) 82.64%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6343      +/-   ##
==========================================
- Coverage   82.65%   82.64%   -0.01%     
==========================================
  Files         305      305              
  Lines       45484    45486       +2     
==========================================
  Hits        37594    37594              
- Misses       7890     7892       +2     

Flag	Coverage Δ
ui-tests	38.56% <100.00%> (-0.02%)	⬇️
unitexamples-tests	71.64% <100.00%> (-0.01%)	⬇️

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